* Separate audio routing for Main and Sub waves: the SPD-SX has a total of 3 "independent" stereo outputs, but the only way to get a pad to output different things to these outputs is to Pad Link two pads (wasting a pad in the process) and route each pad differently. How hard would it be to have independent routing for the sub wave on a pad? As it is, every time you want to play a wave click track, or want to send different samples to FOH and monitors, or even if you want different FX for the main and sub waves, you have to give up a pad to do it.
* Velocity switching: what? Every other drum pad in existence lets you have different sounds for soft and hard hits. Even the venerable SPD-S did it, and the SPD-SX is supposed to be an "upgrade" of that model. All we need is a menu option that sets a velocity threshold, and makes the pad play one sample above that threshold and the other sample below it.
* Round robin: OK, with only 2 samples maybe "toggle" is a more apt term. Yamaha lets you round robin 4 samples, surely the SPD-SX can manage to alternate between its 2.
I don't think I'm asking for the moon on a stick here, it should be a pretty straightforward thing to put in a software update. It seems like an obvious thing to me (and god knows there's enough other people either complaining or just very confused about having to use the pad link trick), but maybe Roland don't see it the same way because they haven't done anything about it in any of the handful of firmware updates over the 5 years since release.