The liberator is overpowered and the infantry gameplay is nonstop zerg spam. Both of these issues can be solved with one simple change; remove the tankbuster from the liberator and give it to the heavy assault, because it's the weakest class, and having a good gun for attacking tanks and max suits would finally make the HA a viable utility in a squad or platoon. It would also be empire specific in the best of ways; TR could finally get a true underslung minigun, NC could finally get something that isn't a shotgun, and VS could finally get a single good weapon on their heavy assault. This would also remove the need to balance liberator nose guns. It wouldn't be overpowered either, because it empties so fast that you need an engineer at all times to keep your ammo up, and it's really big and loud so it gives away your position. Heavy Assaults can't fly either. Infantry would finally have a real counter to vehicles that doesn't involve being at point blank range. This would certainly change the game for the better.