I think a soft cover over the pads would interfere with at least one of the "gestures." Right now, the way the Orba senses pressure is by how much of the pad of your finger is touching the surface of the Orba. Also, soft material absorbs shock, so it might affect the ability of the Orba to sense velocity.
Do you think you'll ever use soft pads on the Orba 2
p.s -Or maybe there could be a way to place something soft on over the multi function keys ?