Hi there !
I think I can help with some of these after using Roon for a whole month !
Roon usually imports only the Tidal albums you have marked as favourites (star) in Tidal. You should be able to delete any unwanted Tidal albums by either removing them as favourites in Tidal, or right clicking on them in Roon and using the Edit menu in the top right to delete. There can be a delay of up to a day for that to take effect while Tidal and Roon talk behind your back about your abandoning this album.
Cant help with iTunes sorry.
Users can’t change the order of sections in screens at the moment. This might be something to suggest in feature requests. There was this thread about sections on the Tidal overview page which makes a similar point.
I can “heart” Tidal tracks. Can’t help here sorry.
An album is ticked if the reviewer thinks it is worthy of special interest.
Tracks are ticked as “picks” by the reviewer. The “Play picks” option will play these tracks.
The ticks are currently not capable of editing by the user.
You can bookmark any focus filter search and the bookmark will re-apply that filter to your library.
Cheers !