First of all, i like the new tactic screen and possibilities.
But there is one big flaw:

Please make a "Save Button" at the new tactic screen while live game is running. Reason?
When you drag&drop a substitute to a wrong player accidentally, you cannot change back. Happened so today, when i tried to change the left MC, but dropped at the right accidentally. So my best player was off the court.

Same for tactic changes, i want to prepare new tactics and substitutes, then press save. So we have full control.