Another suggestion for optional gameplay.

Turns become rounds as optional mode when every pawn (enemy or player) does not stop, rather time passing is set with scale of 0.1, 0.5, 0.8 ...
Setting time to 0 means every pawns are still (like in turn based system).

When combat starts, setting time pass to 0.5 makes every enemy pawn and player's party do theirs action at half the time than player's time pass.

That will make every enemy pawn and player's party move simultaneously with some time shift and do their action.