Allthough Arturia is giving us the silent treatment here on the forum, it seems to me they are actually planning an update. They have responded quickly, politely and seriously to all my feature requests and explained the likelyhood of each request being implemented. Some are technically impossible, such as repeating envelopes and key press independent LFO triggers.
Buttons/switches as mod destinations have been suggested by several users and is apparently possible, so it doesn't hurt to let them know you want it too, if you haven't done so yet.
Send your requests, ideas and questions to technical support! They appear to be interested in any ideas and they will tell you wether they are technically possible or not. I got the impression that any request regarded as an improvement would be concidered, even if it's not requested by many users.
I don't think Arturia have forgotten about this synth at all. I believe they are proud of the Matrixbrute and want to improve it as much as possible with the update(s). As it's still quite new, they'll probably have someone working on minor bug fixes and such for a while anyway, so I would think this is the time for users to come up with some good ideas for improving this synth feature wise too.
I have no problems with features that I don't personally need, such as hidden extra features engaged by multiple button presses etc., as long as they don't ruin my user experience completely. I hope other users feel the same way.