I like it. Let's see...Enhanced Runecarving (Ex): When carving a rune, a Tokunnir can choose to use a rune effect that is one above those he would normally have access to. Treat it as the highest level effect he can carve. This ability can only be active once at any given time, and if he chooses to carve another rune using this ability, all existing uses are cancelled. That make sense?
Hooray, Runecarving hasn't been forgotten!