Alright, I've just pushed a change that enables the mouse buttons 4 + 5 to scroll through tabs of the code editor.
There are two modes:
By default, the mouse buttons scroll through the different callbacks (and external files) of a script editor. But:
If the code editor is in a tab container (like in the scripting workspace)
AND the container has more than 1 tab , then pressing those buttons will scroll through the tabs. This allows you to jump between selected code locations and not having to iterate through all callbacks (it also retains the positions).
I had to hack around in the internal OS APIs to enable this so out of lazyness this feature is currently Windows only (but if someone heavily needs this on OSX, I'll add this).