SC: Reacting on "active pane change"

[Borut]

Short version:

Is there a possibility to hook a script to an event such as the active pane change? I suppose that this would perhaps be a Custom Event Action (CEA) and - as far as I know - these are unfortunately not implemented yet, are they?

If the answers are no, then this is a wish, of course.

Longer version:

If I would like to expand MyTabsets tabset manager script to layouts, column layouts and catalogs (for which it appears to be some interest lately and also I seem to be more and more fond of "a catalog per project" idea, as a kind of handy knowledge management device) then I need to be able to do some things on active pane change event, in order to support separation of "layout environments" per pane as good as possible. (Here a single pane use is implied).