If you need help with a technical issue, tag support and they will respond.
Feature Requests they read (and hopefully catalog) but rarely respond, maybe to 10% of feature requests get a Roon response.
There is a long thread of feature requests from prior to version 1.8, you might want to add it there
Top 10 Feature Requests
And this thread is specifically on Playlists:
Playlist Feature Requests (post 1.8)