How about one more thing for DnD? This time a feat for a caster.
Practiced Caster
Prerequisite: Level 10
You know your early spells like the back of your hand. Choose a number of spells equal to your spellcasting ability modifier. These spell now can be cast as a bonus action, however you can still only cast a cantrip and another spell each turn.
Thoughts?
Throat Punch Games 