I like the Synchron Player (to be fair, I have very little experience with the VI Player). I feel more in control compared to...other samplers.
Back to topic - I throw my voice in as well - and sincerely hope that it's not iOS exlisuve - but Android as well, and maybe even Windows. I programmed in all Keyswitches into Open Stage Control (similar to touchosc, but full free) and think that could be an interesting idea if it is possible to do:
Open Stage Control creates a local webserver, meaning you can access the created frontend from any device that you want (same PC on a touhscreen, android phone, tablet - everything that can pen a website essentially). That might be a direction that could be interesting to look into for the team, if they are planning and have not yet polished everything for a later release. Don't forget the Android crowd and windows tablet crowd please, and consider the potential in a locally running webserver to serve the control surface, that way you don't need to pay any attention to mobile OS developments ;-)