Also I would like to see a tag / attribute "is an expander for [link to module]"
-- wiggler55550

I am always in for "flat" solutions. People could just write it to the module description and place the link there?
I mean, that is not a property we need to search for e.g. does someone need a "show all expander modules" function?

Beep, Bopp, Bleep: info@modulargrid.net