I really wish there were a key-follow parameter, especially for the filter (there are even greyed-out knobs there just begging to get used for something!). Lots of other places it would be useful too...Amp Level, to name but one.
Another way of accessing it (and allowing more routing possibilities) would be if the "Velocity" button in the Synth-Sampler section were in fact a pop-up, (like the "mono"button in the Portamento section), where the pop-up options could be Velocity, Key Follow..and Aftertouch;-)
Just dreaming
