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...