i don't mean technical (electronical) -
technical it's probably easy either if it's analog (resistor or voltage) or digital (i2c).
What I actually meant is software driver support for future text-based PLs.
I'm thinking of stuff like, e.g.,
the MS cam v2/3 (older series),
MS multiplexers for RCX or NXT motors,
or the HT sensor multiplexer.
NXC CHESS for NXT: http://www.mindstormsforum.de/viewtopic.php?f=70&t=6790
indispensable for NXC + EV3-C: easy + trouble-free network & sensor+motor remote control for rs485, BT, USB!