I also agree a Linux server would be nice since I'm pretty much a linux only person as much as I can be. Other than the lack of Linux server and Linux host I love RU and it's worth every penny as long as you're working on Windows only devices.
I also would love a Linux client. I only use CLI so all I would really want is a remote CLI. I don't really care about the GUI. I think it'd be a nice starting point for CLI only. I would love to be a beta tester.