Multiple touch monitors can be handled using the UPDD driver from Touch-Base at: http://www.touch-base.com/
I have run the demo on a single Dell ST2220T and it works fine.
I did notice that their documentation says that with drivers up to version 4.1.8 (latest Win), extended touch facilities (like right click, flicks and some utilities) are not available when using MULTIPLE touch monitors. I am getting clarification on that from them. Of course, a simultaneously connected mouse works fine.
The driver allows turning off extended functions, and the basic touch functions still allow operation of switches and sliders, etc, which is enough to run Cubase - one control at a time.
The driver is about US$200 one-off, but it allows using plenty of ST2220Ts. Just for comparison, a pair of ST2220Ts has as many pixels as a 2560x1600 30" monitor, which would cost 3-4 times the price when coupled with a NextWindow 30" touch frame. However, the NextWindow touch area would be 10mm above the LCD, which would result in lots of position (parallax) errors when used at a low angle.
So, once having purchased the driver, it cost less than AU$400 for each 2Megapixels of additional touch area.
Note that if you aready have some 30" monitors, the ST2220Ts have the same size pixels, so windows don't suddenly change size when dragged between them.
Anyway, I will wait until I hear from Touch-Base about the extended functions, and if it is worth pursuing this, I will get another ST2220T and report back on my findings about how useful the proliferation of touch can be.
PS. Using touch for EQ is COOL!