Hey I've given this some thought too (re: play balance of various units) here's my two cents:
1). re Thor armament. I think adding a 20mm coaxial cannon would be the best/easiest solution.
This would provide some close range rapid-fire killing power for fast-moving shrikes and Anti-personnel duty.
it would also nicely use all that excess turret space and provide a nice balance with the apollo 120mm variant.
2). Transporter. This thing should NOT be able to pickup enemy vehicles! This is so horribly unbalancing I can't even begin to vent my apoplexy when someone used it on me after he figured out he couldn't winnow me out of my perch (and after i killed him 3 times in a row).
Course it was funny that ONE time, he dropped me in the lava.
3). Ablative armor. I think the heavy tank chassis variants (i.e. all the thors) should be able to withstand a couple hits from an ATGM. Look at all those RPG hits M1's are taking in Iraq and continuuing to operate.
4). Active mines. I wan't to see some simple active mines. These would be small, rudimentary vehicles that sit inactive until an enemy vehicle comes within range then they activate and move towards the target with any eye towards exploding UNDER them.
It would be even cooler if you lay a "field" of these and then activate them with a keycommand and move them in a single direction across the map; they move until they leave the opposite map edge, get shot or explode under/ against a vehicle/turret etc. To ensure play balance they should be really weak and get mashed by HE, 20mm, infantry etc.
Would be even cooler if they looked like spiders and climbed all over a vehicle en masse before exploding. The vehicle could activate flechette grenades (see below) in defense or have a teammate blast them with an ion cannon to get em off.
ooh cool
5). Give the cutter a main armament similar to an assualt howitzer (perhaps a cut-down version of the hurricane's gun?). The whermacht used assault guns in combination w/ engineers in ww2. Good enough for them good enough for us. + it might mean that people would actually drive a Cutter in game!
6). HQ/command vehicle.
Drones! The HQ/command vehicle should come equipped with a flying drone for recce + a stock of sensors and sensor jammers that i can drop as it drives around. A SMALL stock no doubt but prolly two or three of both.
It still sucks in combat with that poopy 20mm cannon so balance shoud be maintained.
7). Flechette rounds/ grenades.
With the intro of infantry it would be nice to get some flechette rounds in all 120mm cannon and flechette grenades attached to the outside of all MBT-type vehicles for some kind of close-quarter infantry defense.
