Adding a 'Randomizer' Function with Min/Max Values to the automation tools would be a great help. It'd go well with the pen/line/erase setup. It could even have variations like sine, saw, square, and S&H. I think it'd help the most in creating 'human-like' variation on velocity automations.
As a side note also adding a shift like function to the jog wheel would be awesome in relation to dialing in velocity values. You could shift function into 'new velocity mode' that would allow for selecting of sequencer button and turning the jog wheel to adjust velocity. It'd be nice to use the jog wheel more, like a Roland data wheel.