so you want an at gun to be able to counter weapon crew + infantry + garrison + tank ?
Maybe it needs suppression against infantry too ? and able to shoot down planes ?
Turning all heals into aura heals is just going to facilitate mass retreats and heal-reinforce-go kind of blobs even more (since all squads will be done healing at approximately the same time anyway).
It's entirely possible to change the behaviour of medics to prevent them from chasing moving soldiers. I have already done this in my mod.
It's also trivially possible to increase the healing range of medics, so that clustered squads don't inhibit their movement as much.
Can you confirm if OKW healrate is still 5 or has it been changed to 8?