I found these CSR posts in another forum: http://www.swtor.com/community/showthread.php?t=492273
"This Legacy perk increases crit chance by 1%, even for non-augmentable items."
"I'd like to clear up the earlier confusion. Legacy of Crafting gives a crit chance increase, not just for augmented items, but for non-augmentable items too.
For non-augmentable items that can crit, this increases the chance of getting bonus items when you craft."
"This buff is for the actual crafting itself, and does not affect the Crew Missions."