Crown of Eyes: spell crit applies to attacks? iron will?

does that you unique also transfer critical strike modifiers for spells to attacks? or does it only work with spell damage?

thanks

also, does that mean we can double the strength bonus of an attack with iron will? or will the support gem just not link....

EDIT:
nvm I found out that they don't....... I would use it if the crit worked....

You don't need the crit to work. This is a seriously cool effect that anables some unique hybrid attack/casting builds and helps to normalize wand/staff affix pool for melee.