I mainly use this for controlling modular synthesizers. It has four CV-outputs, one for each control direction of the pressure plate, top/bottom and left/right. I find it very useful to expand the playability of modular synthesizers. The Touché has become a part of the modular system as an musical instrument.
The thing I would like Expressive-E to expand on is the software/firmware when you use it connected to a computer, as I would like to go beyond the low resolution Midi-signals and have the Touché to send OSC (Open Sound Control) so you for example could control Max or Max for Live with higher resolution.