Just make it so that as long as someone has the right DoH leveled, they can repair anything, anywhere, provided they have the dark matter, without actually needing to change to a crafter. All that class switching is a convoluted mess, and it won't work on the fly during a DF instance. Should be able to repair others' gear this way too.

Materia Melding should also be streamlined like this. While you're at it, make the menus more convenient and stop resetting to the top of the list with every. single. meld, it's so incredibly bothersome.