Some (if not most) of this stuff you may already plan on adding; but just in case, I put it there.
When you press S to go in reverse, instead of going in reverse the vehicle spins around to go backwards. This is very annoying as it proves as it makes backing incredibly hard and gives you no way to brake.When turning, the front of your vehicle turns left or right. This is great and all, but it makes it very hard to straighten your vehicle. I suggest you make it so that D and A move clockwise and counterclockwise.
Give players the ability to change what keys do what.Allow you to change what vehicle you respawn with in game or do what they did in BZ and allow you to switch craft with bots.
Add repair/ammo crates to the instant action game that involves a ton of jumping.
Make a build radius so that you can't build everything as far out as you want.
Change the voices to something more familiar and easier to understand than Microsoft Sam.
Add splash effects when your vehicle fires in the water.
Sometimes, after jumping, you get destroyed because you are going to fast. This is turning out to make ramping a major pain when you die half the time. I'd make it so that you must have a much higher impact to be destroyed.
Make some interactive voices (such as when you shoot at your allies or when they have to wait too long for you).
Allow the pickup of extra repair/ammo/boost crates so that you may use them later on.
Make some strat instant games. Though I'm sure this is still far in the future.When the factory builds units, it uses the same build animation for all of them. Perhaps you could change it so they don't all look like they are making some scion scout ship (or whatever that is).The resources should probably not be using decimals. I suggest you bring that up an extra digit (80 instead of 8 ).
Have the vehicles slow when turning.
Add a third person view, some prefer to drive vehicles with turrets in third person (like me).
Allow driving and fighting while having menus open.Some various vehicle explosions instead of the same thing for each one.
On endless madness, allow the viewer to change the camera position manually instead of automatically.
If you don't add the changeable keys, move the boost to shift. The 2 key is very awkward.Show what the building will look like when you are placing it (instead of the targeting radical).
In the tutorial, haulers only pick up the crate that you dropped... perhaps you should look into this.
In the tutorial, I suggest that a steady supply of crates should be randomly dropped on the battlefield, as well as a very small amount of enemies to fight.
In the tutorial, the first time you build something, it pulls up a menu to build only one thing, but after that, it brings up the build queue. Why not just have the queue the first time? EDIT: It says next instead of build the second time you do it and for the rest of the time, why?I suggest you make it so that the repair tower replenishes half of your boost.
I suggest that in the tutorial, you make the jump crossable
without boost, being as it is just a tutorial, not a test.
In the tutorial, you could only cross the ramp from one side, not the other.The haulers, builders, and buildings (mainly factory) aren't in squads and have no quick select buttons... can you fix this? I don't like having to drive halfway across the map to tell a unit to do something.
Make it so you can send units to buildings, or allow placement of nav beacons.
In strat games, you can go inside of factories and destroy them from the inside out, where the enemy wont shoot you. Maybe you should put some sort of field up to prevent enemies from entering your factory?
The repair towers don't repair builders.
Unit responses and other voices ("Yes sir!" "Acknowledged," "No can do," "Under fire!" ect ect...)
In the strat skirmish, the bases are awfully close. Could you space them out in the next map you make?
Add a map editor.
Make some new units and factions.
Increase the range on your target thing (the thing that you use to tell units where to go and what to do).
Allow helicopters to pick up crates on their undersides.
Add some sort of neutral building that you can capture that will slowly increase your supplies or make units.
Allow the production of up to three factories (but make them really slow to build).
Allow the changing/addition of weapons to your vehicles.
Put in a little marker that shows how much you must lead targeted enemies, not having one is really annoying with the amount of air units you have.
I'm not sure what sort of weapon the planes are supposed to have... but I'd say change it to some kind of dive bomb or chain gun.
Put in a repair function for buildings.
Allow the selection/manipulation of multiple units at once when working in the menus.
Make a mini-map to switch to instead of radar.
I don't really like how the parachute system works with crates.... sure it works now, but it's not very realistic. I suggest you change that.
When you die and are being parachuted down, make your vehicle invulnerable. I hate getting shot up by planes and heles while I'm falling.
Give the turrets more range. I can destroy units easily without getting in their range.
Bring back the howitzer!

Change the current turrets to light turrets (make them weaker) and add some heavier ones that are more costly (and much bigger).
Make a barracks that allows you to create unit squads (that could take a little work...).
Put a pad beneath the repair tower so that you can see where you're being repaired, and make the range bigger.... In fact, I think it'd be kinda cool to drive into a sort of box and have the tower move around the top & fix you. That would also prevent people from firing under the safety of the repair tower.
Make repair crates a bit more common on the fighting games.
Make enemies collect resources.
Allow for recycling of units.
This game looks awesome, much better than I could ever do, but you may want to take some of these into consideration for future development.