View wireframe in Paint Mode
Currently it seems the wireframe can only be viewed in Geometry Decal mode. It would be very useful for hand-painting textures to be able to have it active in Paint Mode as well, so that the underlying geometry is easier to follow.
Is there a hotkey to toggle on and off the wireframe?
This feature is in. in 2.6.1 you can go to viewer settings (by default it's with display settings and textureset settings), scroll all the way to the bottom, and check wire frame.