Maya doesnt have a snap to refline or insert point into line...its been a real pain for me. Im used to Survey software that does it...as stwert said though this package isnt designed for accuracy. Acid and jspogg have the right ways...painful stuff. I too have asked this question...I wanted to make lets say 10 random points snap to a refline...no can do...you have to snap to grid first and then try to rotate and move them or cut faces...pain in the butt.
cheers bullet
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes