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Hello Mark,
thanks for sharing and sorry for the late reply.
Right now you can't do this. Something along those lines is planned
for future releases, though. For now, all I can offer to you is the
Filesystem browser.
You can add any action a behaviour exposes into virtually any place
in a custom menu. For this, just select "Mark's profile" in the Menu
tab of the preferences and drag the desired action from the left
palette to the place you want it to appear. That's really it :-)
Best regards,
Felix