All of you probably know how you end up wasting loads of mana since you cannot use it in any way before it disappears, especially during survival / pure strategy / harder difficulties.
Most of you probably also agree that mana farming is just a boring waste of time.
Allow picking up mana crystals with full mana pool.
Mana picked up this way is split between players and banked.
Some of you (devs especially) may think that this will hurt longevity of the game, but I disagree strongly. Mechanics requiring needless grinding will often discourage players to continue, and leaves a bad impression of the game.