Welcome to the Roon community! I think you’ll find people very helpful here.
I will address your first question regarding album art. There is currently no way to show the back cover - or any other covers such as liner notes or other images. There has been some discontent about this, as many users purchased Roon due to this selling point, as quoted from Roon - “The era of the LP and its gatefold sleeves filled with incredible imagery is in the past. But the images are not. Roon puts them all at your fingertips again.” This text has now been removed from the main Roon site, and replaced with an image contrasting a colourful LP gatefold sleeve with a boring file browser window - so the meaning is still the same.
HOWEVER - there have been many requests for this feature (such as from @timlumley and many from myself :D) and I believe that it is on the roadmap, i.e. the possibility should be added in a future release. I am hoping that it might be the next release but we’ve had no confirmation of when.
There are a few other threads where you can read more about this issue and which you may want to contribute to; in order of size:
It’s also on my Top Priorities list for the next version: