On the Mailing List i think it was Luc-Eric (sorry if i got that wrong) who said they suggested a User-Voice system some time ago and the staff wasnt interested at that point. They were surprised when max went for it.
Max community seems a little disappointed with the results, but they should be very happy, imo. Already saw maya users requesting the same and i can only encourage you guys to press for it whenever you get a chance to speak with someone from AD or with their representatives.
When I first saw/heard of the User-voice feedback that Max has, I was told that it was basically a trial system that had worked on other ADSK products and we were looking to see if it worked. I kinda like the system because it helps users think about what they really
want, and being as you only have a certain number of votes, its like having a budget. If you have a budget of $100 and 10 features, spending $10 on each one won't get the work done, so you have think where you spend your cash, so to speak.
It's not a silver bullet though, but its a good way of getting more peoples input on a variety of issues.
In terms of feedback on things like Beta, Softimage still uses a mailing list format, which is ok, but personally I like the ADSK format of forums which Maya, Max, et al use. The Beta website has forums like this community with different sections for things like UI, Modelling, Rendering, and so on. Then the product designers post the features with videos for people to feedback on.
A mailing list is fine, but imo it feels abit 'dated' I think Softimage would get better feedback using a forum based approach. It's also easier to follow.