Pixma just worked for me with GNOME ams the built in scanner app. If you mean network scanning, that’s a different story

If you have a machine with decent RAM them don’t worry about RAM usage. You don’t really gain anything by dropping 4 gig RAM usage down to 2 gig RAM.

Session is what you want. But you have to directly shares each others public keys to connect

I forget which distro now, but I installed one that on first boot cones to a welcome screen for adding a user. Install just got the OS ready to deploy. It was a bigger distro, but I forget