I also vote for such an enhancement!
My model is the browser’s ALT-Left/Right arrow to go backward and forward to previous positions. Exact column positions is less, or not at all important. In fact, I would rather not “waste” edit points on “micro” positions, say on the same line. What I need is “macro” jumps to code segments “under construction”.
As for edited out positions, a line above the original (or below) is fine with me.