Myth is myth. If it doesn't support your card it doesn't support your card. I would check the mythtv forums/wiki to see if anyone has had success with your specific model... then a template would have to be written in LMCE to support it automagically if you are able to get it going.
Your network share should just be detected, you would enter your username and pass when prompted, then everything automatically populates. If this is not happening, then something is almost certainly wrong with your networking setup. Nothing on your internal network can be spitting dhcp, no routers/servers... just DCERouter. You will have to convert your routers/aps to switches (turn off dhcp). Please give some details on how your network is setup.
Is your bluetooth dongle recognized? What exactly are you trying to do with bluetooth?