Really cool update. I like the tactics option very much. It would be very helpful though, if you could choose which dice to use to pay the costs (shift click?)... it would be much more tactical this way, if you will.
If you want to avoid an extra selection step, it could be done by allowing to (temporary) reorder the party (without changing enemy targeting of course), and then using the dice from top to bottom as it is now.
Have a gerat day!