Does any one mix Runes of different Elements?
If so, what scenarios make this beneficial?
Just wondering why:
1) Runes aren't applied simultaneously and
2) Runes aren't tracked with a little number like Dancer Finishing Moves.

If there is a use for multiple rune types, great. Enlighten me.
If not, I'd like to be able to fully swap runes when Elemental Magic of different types are cast.