The highline addition is quite expensive I think - sure I read somewhere it needs a dash replacement as well! Probably not worth the bother TBH, unless you will really use it for Bluetooth or sat nav etc.
I dont think you have to hav ethe MFSW to operate the Highline - you can still use the stalk as you do on the midline. The MFSW just makes things much easier as all the buttons etc are on the wheel within easy reach of your thumb!
On the right side you have the Menu, OK, and Up/Down buttons - which are all used for the Highline.
On the left side you have Volume up/down buttons, a phone button (if your have VW Bluetooth installed), and a button which mutes the audio/radio.