Thanks for asking, Helge.
I would certainly be happy to hear feature requests. So far, the big request is a Word-for-Mac port. I'm doing this between full-time teaching and family time, though ... so I'd like to know there is significant interest before I put the time in.
The Free version currently cuts back the Settings Dialog: access to commandline options for LilyPond, resolution settings, default image transparency, and editor customizations (like font and pretty print, or hiding the panel by default on startup), logging, document inspection (list all the MsLily images, etc). As well, the Free edition blocks out the Advanced editor. That editor provides stock wrapper/boilerplate code (\page, \layout, etc) for margins, line width, ragged-right, etc. All that can be modified in the current Standard Edition.
Long-term, these two are started but incomplete in the Stndard Edition (SE):
* Full capacity Templates menu: this is a Ribbon button that provides a way to collect and quickly re-use common code excerpts. Both editions include some stock templates (a blank staff, a clef, etc), but I expect the Standard Edition to have a user modify-able menu and load-able code collections. The goal is to let others write and distribute their own code collections for use in MsLily.
* insert image with MIDI using OLE
I'm expecting a free-mium-like model, where the Free Edition is always free, but SE helps direct what is created next ...
Admittedly, it would be good to have a few drops put in the grad school loan buckets!
Cheers from Melbourne ~
Denton