Wow guys. Ok to answer the first question, yes it is a %. here is some data proving it
http://www.silkroadforums.com/viewtopic.php?t=48121
Crit is about double physical damage.
Now there is so much false information here you guys are scaring me.
For chinese characters physical skill =physical damage. imbue=magic damage.
spear user using physical skills will use imbue and the damage dealt will be a combination of physical and magical damage.
Magic attack value on a weapon is always higher then physical no matter what weapon you look at (chinese). Not the other way around
Int users crit as hard as str characters when both characters are using imbue.
int users have less physical attack but the average damage from imbue is higher.