I'll try to whip up something like that right now.
Will probably include something to prevent overwriting of new appearance, too (admin only AND/OR minigame only)
edit: Okay, I've dunnit.
http://puu.sh/9QCPR/2b50ddf351.zipI'll release it in add-ons soonish, but this is split into like 5 events for usability's sake.
editAppearance = editNode and editNodeColor combined
editNode = set node visible or not
editNodeColor = set node's color
editFace, editDecal - self explanatory.
you can input "ALL" in the node string, by the way.