1. A quick and transportation for two vehicle. This vehicle would appear at various points on the map, but not out on the mini, for when you have to make a quick movement but do not own a vehicle. It could be a motorcycle, bicycle or horse.
2.Akimbo. In the case of guns and weapons at hand, if you have two equipped, like the burdens of a bazooka, you duplicate the ammunition and cadence at the cost of reduced accuracy.
3. More vehicles. Another new tank for each faction, or a new APC, a bomb mounted on a truck, a vehicle of artillery or rocket launchers, a vehicle halfway between a tank and an APC or tank killers. They could also be maritime, as a fast patrol boat with a mg or a jet ski, or amphibians, such as BF3 AMTRAC.
4. The TOW that can be placed.
5. More weapons. It is that armies have regulatory arms, but not the only one used. For the same type of weapon within the army that you have alternatives. And appearing in the armory.
6. Helicopters. This is the least likely of all. You could put the helicopters, you do not would control the altitude, as it always would go to it. They appear on the map and would climb by pressing a key. The only serious movement in the xy plane. There could be transport and combat. To lower the same key would be used as a field or an open roof.
7. New modes. As capture a neutral flag and bring to your base x times or steal the flag of another base. Also a way with limited respawns or kill some specific targets, to encourage stealth number.
8. vehicles are not glued to the floor. I know it's a thing of the engine, but throw yourself down a hill jeep when you go fast and go to the ground is rare.
9. More maps. A map centered on vehicles or map of islands. Also a map of mountain, with some villages and houses scattered across the map, roads linking them, many cliffs and a stream, and this snow.
10. A new faction. It could be the Japanese, the Chinese, Great Britain, Italy, Spain, Portugal or any country in South America or Africa.
12. The ai use the stun granedes.
13. More stun guns. And once they are able to stun interrogate them to find out where are the car and the key points.
14. Soaking. When they are in the water you can dive to lower the probability that you get and reduce the chance of being detected.

It is very rare that many serious things that might do them, like helicopters, but others such as akimbo and a new faction does not seem so impossible.

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Running with Codex
viewtopic.php?f=11&t=2435

4. There is already. Just need to unlock it with briefcase or cargo truck
9. Unofficial island map is under work
12. AI uses stun grenades. Not too often, but they do.

I like the akimbo idea