I used click & drag to make multiple dice attack at once, but getting a good attack trajectory was difficult, especially because the drag distance and direction affected power, so it felt awkward to attack with multiple dice sometimes.
I tried incorporating the bank into moving multiple dice, but it didn't quite click for my brain. Might have needed more time or practice, but it felt like just one too many things to handle (for me, personally). I ended up using the bank to hold 1s I wanted to keep until I either needed the extra firepower or rolled enough 1s to trade in.