1. That would be the same as Irradiator tank. Not a bad idea but the problem would be model and animation. Making new infantry is not easy. Adding it might delay 008 more.Here are some ideas for later versions ...
1.Nuke General- Radiation Soldier capable of firing streams of radiation at his enemies. (Rank 1 or 2)
2.Assault General- Mortar Soldier capable of Bombarding enemy defense positions from afar. (Rank 1)
3.Explosive General- A Helicopter able to drop bombs(or terrorists) on enemy units. (Rank 4)
2. Mortar Soldier would be better with Infantry General. I like the idea but the model is used by ATGM troop already and there is Grenadier at rank 3 (which is very good in numbers). Also Assault Gen has 4 artillery units (Katyusha: r1, Dana: r3, Missile Buggy: r3, Karkardan: r5), which is enough in my opinion.
3. The idea is pretty much the same with Helix + Bomb upgrade (Flame gen). I don't think it's a good idea. But GLA will have something good that can go over obstacle (Creator is working on it).