By repair anything from any class, I believe it's just a convenience as opposed to changing classes between repairs. You'd still need the proper ranks in the other classes. What I don't is that little glitch in which between sitting and standing after a repair, "Browse" vanishes and trade / invite / LS invite is highlighted, causing a lot of accidental invites and trades. There's barely enough time to change classes with a macro and hit "browse" before it vanishes. Repairs are fast and competitive.

Another thing. Please stop deducting from a player's inventory when they put an item up for repair. Make it yellow like an item is in the trade window when 'in use' and reserve the space to repair it.