Just thought I'd let everybody know that DSPad and xDS2Key was a massive failure for me. The mouse controls worked fine (as fine as it could the way it's set up; I'd prefer it to act more like a touchpad than like a tablet, but oh well), but the actual buttons only worked on every eighth press or so, making it completely unusable. I ended up using DSPad 0.2 with the regular DS2Key server (version 0.7 beta). There's a newer version of DSPad, but the xDS2Key author recommended using the older version, so that's what I had around when I switched to using DS2Key from the x version. I guess I'll try out the newer version next and see how that works.
EDIT: DSPad 0.2b works fine with DS2Key 0.7 beta, so I guess I'll be using that until something better (like a fixed xDS2Key) is released.