Doing It Together

Pulley menus are part of Sailfish OS user interface, and in the level you describe these changes, that would require hacking of some closed sourced code owned by Jolla. So, unfortunately the community can't help you achieving that... distributing these kind of changes would not be allowed without an agreement with Jolla. As an option, you might want to consider it as a patch instead (in patching, I'm sure community can help if they want to)

@simo: Thanks for your comment. I'm saddened not to be able to express encouraged enthusiasm, but at least I now have more of an idea about parts of of the situation.

Kludging about in the dark trying to bolt improvements onto code I can't see is unfortunately a profound waste of time (only my own time - others may find it informs their learning and approach).

Taken individually, each improvement proposed might not take long to implement for a developer familiar with the code and Qt - may only a few lines of well-positioned instruction and explanatory comments. However, those basic ideas which seem obvious follow-on enhancements to whst is already there will have to be done by someone else, if their management team at Jolla is thus inclined, unless or until the sources become public or otherwise available.