For repairs I would like a "Repair Kit" that could patch up the item to 75% and could be used by any class and rank to repair any item. Then I would have people who repair things properly and use the correct mats a chance to be able to +1 the repair. This could give the items 125% durabilty until it drops down and is repaired again. You could even take it further and give the item the stats of a +1 item until durability dropped to 100% and so on. This would encourage proper repairs and still allow people to patch up items while out in the field.