I haven’t been able to find the answer to this. Would I be able to browse songs from Roon on a Squeezebox touch/Jivelite (with Squeezelite), as well as play and pause using the Squeezebox/Jivelite touch UI?
As Long as the Touch can access the music library yes.
You can access play, & pause, skip fwd and jump back songs in a playlist.
It can also display album art and song info for the song currently playing.
You can’t navigate Roon library from squeezebox only play /pause skip. It will display now playing but I found it too be a bit buggy on squeezelite devices.