Taken from the Forgero Discord:

I also think repair kits need an overhaul, potentially even removed for lower tier items. Either that or on the go repairing needs to be removed
I like the idea of having them for on the go repairing while caving or fighting mobs, but then you can just repair wooden/stone tools with the material it's made of (which I don't like much)

How about this:
we remove the repair kit repairing recipes from the crafting table. We make it possible to load a repair kit with x amount of the same material, depending on the stage/tier (we could also do something with how much it actually repairs) of the repair kit.

Instead of using it in the crafting grid, you hold a repair kit in your off hand and the tool you want to repair in the right hand and right click

Sounds good.