If it helps, I've created an Action Points system to address this exact sort of issue:
https://docs.google.com/document/d/1z6U ... p=drivesdk
You can Walk, Channel and cast a Petty Spell, or Run and cast a Petty Spell, or Walk and cast an Arcane Spell, all in one turn with this system.
The way I see it: if everyone can Run without penalty *and* take an Action, it seems like those who just Walk are losing out. So they should be able to do something extra to make up for it. Also, Free Actions are a bit too 'let's wing it!' for me.
My view, though, is that even in the RAW, Channelling only uses your Action, so you can still Walk or even Run before doing so. There's absolutely no reason why you should get a penalty on Channelling if you move, as you would move and then Channel, as discrete actions, rather than doing both at the same time.
Remember that a combat Round is usually about 10 seconds, so that's plenty of time to move and focus on your mojo without one impacting on the other.
I am generous enough that I would probably let you Channel twice if you didn't move at all in your turn, too. After all, Channelling already sucks.