New(?) ability is wanted on the repair screen of the army

if we are talking about repairs, many people probably do not know how useful it is to have a level 1 buggy or rocket soldier that is damaged at 1% health
it is a permanent distractor unit that never eats up the wall or barrier it is trying to kill
the problem is it is really hard to obtain, and then you have to repair units manually in order not to destroy this precious unit
it would be really helpful to be able to choose how much to repair units instead of only full repair like it is now