The title says it all. You have a "stepper" option, but nothing to generate random shifts of cutoff freq. This feature should have the option of "stepped random" or "legato random".
Heck!! Just update the darned thing! Include MIDI CC output to other VST MIDI CC.
You know where I'm going here. Seems you folks have yet to dream up a Modulation Matrix Instrument/Effect. For sound design, that would be, what do the youngins say, "really dope". Or just plain nice.