How do I paste or type without moving the insertion point? (10.8.x)
I have never seen such behavior on an OS level. This is likely because such behavior is normally needed for a very specialized task like programming or spreadsheeting, which would be better handled by individual applications.

You might be able to rig something up in Automator that could duplicate this behavior, but I suspect you probably want a different solution.

You can easily do what you need using Sublime Text's multiple select feature, without having the exact behavior that you describe.

In general, if your scripts are starting to get very repetitive, it's probably a better idea to figure out how to easily automate it, rather continue down the path of manual repetition.