Rogue/Warlock's skill "Dark Soul Smelt" scales with magical critrate instead of physical.
Since the skill has been changed to benefit from physical attack instead of magical attack it should use physical critrating as well.
Furthermore, I suggest making the skill skillable and thus make it scale with level. Currently it is useless, because the damage at level zero is far to low. This change would make rogue/warlock an interesting and viable class combination.
Maybe it would be possible to include those changes during the upcoming class rebalancing ?