Jim Roseberry
Sonar X2a and Usine are the only two DAW apps that (currently) support multi-touch.
The later (IMO) is not really a main-stream/common DAW app...
At this point in time, you don't really have a choice.  If you want to grab/manipulate several faders/etc within X2a, you have to be running Win8.
I don't think it makes much logical sense to run an un-patched version of X2... so you can use a dated implementation of multi-touch under Win7. 
Multi-touch support was enhanced/refined in Win8...
 
BTW, Multi-touch under Win7x64 doesn't work with any other major DAW application.
Never tried with the stock install of X2...

Wasn't genuinely suggesting to run unpatched X2 now, only pointing out that, according to the Intel marketing blurb I linked-to above, it was supposed to support multi-touch originally.
 
That Sonar requires X2a and Win 8 for its multi-touch implementation does not alter the fact that Win 7 did actually support multi-touch, which is all I was pointing out earlier after you'd stated "Yep, multi-touch requires Win8".
 
Btw, as you probably know, multi-touch control for Sonar or other DAWs (and also some audio interfaces and mixers) does not even require multi-touch support in Win 8 (or Win 7), only a WiFi-enabled network connection and an i-device and control app, e.g.
 
http://www.neyrinck.com/v-control-pro-sonar#menuTopjump