I have a copy of the SDK. The documented commands are ... limited. However, I know some of the telescope community especially has reversed engineered the software bundled with the camera and have discovered other capabilities. Unfortunately I don't know of anyone that has figured out how to pin the shutter open.

I think I'm having a good amount of luck on mounting my rig. Based on the links provided earlier I've created a steady-rest with two rollers under the lens, a spring loaded clamp to go over and a variable riser under the back of the lens (that also supports the camera). On top of this I've added about 12 lbs. of beanbags. I can go several hundred shots and not drift a full pixel (~40 micron object distance) but I'll need to wait until I get a finer positioning stage to see how well I'm splitting the pixel distance.