For my playing, the LFO portion of the BEF Pro is what gets used most frequently. 4 of the 6 presets are LFO shapes paired with your expression pedal for modulating LFO speed. As you work toward the SB2 model, it would be wonderful to have the option to do static filter sweeps with an expression source. I would be particularly excited to use the GadgetJunkie setup with my HH3 on the neck of my bass to control the sweeps. I'm sure you get overwhelmed with requests, but I figured I would offer my two cents.
You are thinking exactly what I was thinking. And what if you could cycle thru different LFO's with the HH?? Definately a feature for the BEF SB2. But I still am wondering if I can get multiple HH control on a SB2 pedal. I think I have a work-around in place once I get a Midi-Exp or a Midi Solutions "pedal controller" that coverts the expression input into midi. It's all about the CC's available