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How would I create a scrollbar effect? (When the scrollbar moves down, something else moves up)?

Even more so, I want new actors (once created vertically) to extend the scrollbar

Well, if you want something to decrease, as something else decreases, that is pretty easy. All you need to do is subtract. Here's an example of that.

You may or may not need to create new actors depending on the scroll distance though. One method is to create all of the actors, and parent them to something like the reference actor in the ged I posted.

Ahh wow. Thanks sky

And using y=min(0, max(y, -240)); you can easilly control how far on the screen it goes