Not sure if this has been suggested before but here goes!

Essentially, it is an item that is a marking removal and an RMA in one that ONLY affects one slot.
I would assume it would be 2 GB, (though i'd like it to be cheaper)
It would make the process of RMAing several times in a specific slot MUCH easier, since you'd only have to click once to select the slot you'd like to RMA, and the game would both remove it and add a random marking to that slot all in one go.

It's not necessarily a NEED, but it is for sure a massive want! especially for people who are very big into RMAs :)