Hello Martin, hello Gert,
but as there are only a few jQuery-based plugins and Holger's integration is fresh and new, we could take the opportunity to establish this closure thing as "best practice"?
I think what Martin means with "this closure thing" is the code he'd given! I didn't read about in the documentation, that I've downloaded about an hour ago. Maybe there was an update?
Similar code could be used by all jQuery4CMSimple using plugin authors, to use noConflict(), to make available $ for other js libraries. If it really works for jsTree (i've not tested it for myself, I do not even understand exactly what it's doing right now, but I trust Martin), it's fine with me.
Thanks for the suggestion, testing it soon,