Please allow the repair hotkey to target unfinished buildings. I would not know a reason why this would cause any trouble.
The reason why I am proposing it, is the same problem that was fixed with the alt key not targeting buildings anymore.
If you are the northern player and put down several unfinished palisades, as while quick walling, and the enemy arrives with scouts, attacking these unfinished walls, you often CANNOT target the walls to finish them. The scouts hitbox is bigger than the palisades hitbox so the villager instead wants to attack the scout and not build the palisade.
I know some people here dont like quickwalling, but since this issue exists more frequently for the northern than the southern player this should still be fixed. Allowing the repair hotkey to target buildings would do exactly this.