Rather than a topic of dumb ideas, this looks more like a mixed bag of questions and suggestions (some might even be reasonable).
I'll stick true to the topic and make a really s̶t̶u̶p̶i̶d̶ reasonable suggestion that won't definitely break the game at all: make asf able to apply their dps to ground targets. I mean, they can already shoot planes that are on the ground, so why not?
Interesting point about the weight of the mass veterancy system and the shield overspill (although the latter is something definitely noticeable). Still, going back to the old kill x number of units to vet would be a step back, but perhaps disabling it for some units, like the mentioned asf, wouldn't be all bad if it could help make the game more playable.
Removing the shield overspill is definitely an idea that is on topic with the thread: nothing like making an unkillable firebase with just t2 shields stacks that not even a GC shooting in the middle of it will break.