Well i wasn't talking about taking it that far lol... you still have to repair manually but i don't think it should matter whose inventory your in to repair as long as players are linked.. that would be one of the drawbacks of exploring solo and splitting your group. But to have players together then have to move item to this inventory repair and give back is needless and tedious. Same with the trade window.

As far as system with swapping i agree and thats why i think stabby has the right idea with a seperate crafting window where items only try to combine and not swap and leave inventory as is.