Moving will be made to interrupt spellcasting at a point in time...

[Lienn]

i'm getting a headache over this because it's just so dumb.

PvP was the only argument in yoshi's post that actually counts.
interrupting spellcasting BEFORE implementing PvP is just not right lol

and somehow i think i'm the only one that thought of a compromise,
that goes along with all of Yoshi's arguments - including PvP:

[SIZE="6"]walking mode while casting[/SIZE]

Or simple make cast time longer while moving. If a spell has 3 sec casting time standing, then have 4.5 sec if running.