Sorry to take so long to reply, yes all your steering wheel controls work just fine. The ch +- button takes care of the track forward/back function. On the head unit the scan button is the play/pause, the 1 RPT button is the back button the 2 RDM button is the enter button and the tune/folder up/down rocker switch emulates the up/down buttons on the Zune. If you follow the instructions here
DIY: OEM Navi Conversion to DVD Receiver/Etc. you could see your Zune's display on the head unit by hooking up the sound gates video out to the head units new video input. That would be really cool albeit a little expensive for my taste though.