Being able to do partial reinforcement. That is, any amount instead of FULL or HOWEVER MUCH LEFT. It's annoying and frustrating. If I want to add 1 reinforcement to three tank units each that are at, say, strength 4, why can't I?

I'd be very useful to be able to partially reinforce (by one) units. It's been a frustration that it's not possible to do this. I can reinforce a unit with 1 strength to 10 strength but I cannot add 3 strength to three different strength-1 units. Makes very little sense.