We hadn't considered those specifically, no, but we are aiming to make the interface to use your own controls as easy as possible.
I figure if we have the serial stuff, plus a very customisable setup for any USB HID devices (because, yeah, there are quirks and issues dealing with Arduinos, even ignoring cost for a moment) would help.
We are also looking to do smaller web interfaces and even a dedicated mobile app to do 'thin client' stuff to emulate some of this.
We want to try and get as many people as possible into using whatever hardware they even - even 'just' old tablets lying around - to serve to enhance the experience.
The UHID board looks perfect, too - very elegant way to do it, from the looks!
So, yeah, we'll always support Arduino for the DIY insanity, but more elegant solutions would be ideal too.
Probably the most work for us would be doing output stuff through stuff like the UHID? But that's not saying much. Still worth doing, most likely.