This has been around for quite some time but I couldn't find any post (searched on blizzard walking, volley walking, challing while walking, channeled walk)
Anyway this is the simplest thing ever, Just walk straight and cast volley of blizzard and you will like channel half of it which are about 2 hits on enemy's. Hint: Good way to escape, easy slow effect
You can also channel walk first aid stuff but now you should do it a little different, stand still use the bandage and immediatly start walking taddaaa you'll channel about half of it.
Note: Do not turn around or stuff while channeling this just keep walking straight