I'm using the Qubes network manager and the default fedora VM will not start so I don't know if a network manager in there will work.
The alternate linux hardware drivers were already installed.
Why make Network Manager available if it can't be configured in Dom0? The good news is that you can install and run it ENTIRELY from a SD card. The bad news is that installation takes FOREVER and the UI looks like it "hung" and of course it is painfully slow. Qubes needs A LOT of work but I think it will work for me, surprisingly, because I need a secure linux platform that doesn't REQUIRE TOR. Tails is hard to beat and would be nice in a Qubes VM so I could use a Qubes browser for sites that refuse TOR but for now I can't even figure out how to make an ISO available to Dom0.