A dynamics/dynamic randomizer slider would be a nice feature. Like on Toontrack's EZ drummer 3 grid editor.
You record with midi and you can afterwards manipulate the dynamics of the selected notes. The slider at zero wouldn't affect anything and increasing the slider makes the selected notes' velocities closer to each other - lessening the dynamics range.
Would be even better to have all the slider options from EZ drummer. So convenient and easy/fast to use. (Velocity, Dynamics, Randomize and Slopes).