Regarding knobs.
I was using the BCR-2000 for about a month and had it pretty tightly mapped out to tweak features all over modul8, but when it came down to it, it was pretty damn near impossible to keep track of everything and even a template didn't help that much.
I haven't looked into it after that, but I figure there are about 12-15 features I use alot and mapping to some midi control would be a time-saver for those... maybe.
Make sure you look at what you use alot, and consider a controller that matches your style, rather than just trying to maximize the modul8 feature set.
Your mileage may vary.
I still think the Mawzer would be pretty tight if it could be set up to emulate the modul8 interface, but they still haven't released product?! unbelievable.