I am animating a pain in the butt mask around a character, got about 7 seconds frame by frame to realize I missed a part. I tried going back and editing it...but a moved vertex on lets say second 3, will not stay moved since it was not orignally done.... it snaps back to its key-framed position on the next frame since thats where it was when it was key framed. Is there a way to make it stay in the moved spot for the duration of all keyframes following where I need to change it? So from 3 seconds to 7 seconds it would adjust to be in the new spot...I don't want to start over :\

Undo the added mask-point, and 'fix' the missed portion using a new mask. Watch what you set the new mask's mode to, the right mode-setting will depend on the settings on the original mask. It's actually much easier to multi-mask some things: human bodies are complex shapes, I tend to make a mask for each long-bone (forarm/hand, upper arm, torso, head, etc) and track them all individually.