This would add a "charge" function to the Mana Blaster: if right-click is held down, the Burst will "charge up" with some sort of visual effect, with a full charge (this could be significantly slower than a Bow if you're worried about balance) being more in line with a Gaia Spreader's Mana Burst (after the existing Blaster multipliers to speed and capacity). Tapping right-click would still allow it to function like a normal Mana Blaster.

A fully charged blast could have special bonuses, depending on the Lens it's equipped with: Damaging would deal more damage (losing a proportionally higher amount of Mana as it does so), Bore would break a larger area of blocks (I'm thinking 3x3, and again its Mana loss would reflect this), and the four basic Lenses would have their effects accentuated... that's all I can think of (Entropic already works based on Mana Burst payload size, it doesn't need any bonus), but maybe you can think of other Lenses that could benefit from this.

Not interested in doing that.