Channeled abilities

I wanted to try a Flameblast build but quickly discovered that it is largely unplayable without being a WASD user. It also feels incredibly clunky having to hold down the key until full channel regardless of input choice.

WASD Experience
- able to move in any direction without interrupting a channeled ability

Mouse Experience
- have to preclick if movement during a channeled ability is desired, locking you into a set path during the channel
- cannot input a movement without interrupting a channeled ability

Proposed Solution
League of Legends tackles this issue with normal & quickcast settings. For example, quickcast would have the same effect as PoE offers currently with a similarly channeled ability, but switching to normal cast allows pressing to begin a channel, and then pressing again to release. This should allow for free movement and much smoother gameplay with both input options.