Add a “Repair All” button to the stash, to quickly select all repairable items, then de-select any items not wanting to repair by alt-right click as usual.
While in the armor or weaponsmith shop, Alt-Right click on your stash items to have them repaired, for a small fee of course!
That can get quite expensive early/mid game, I would suggest increasing the max tool capacity.
A wise general wins before the battle, while the ignorant general must fight to win - Zhuge Liang