You can be quite sure, the problems associated with leaked OS versions being public is a challenge for Research in Motion.
Research in Motion would be far better off if the leaks never happened. They would not release the software until it was thoroughly tested and ready for the carriers to support it.
The employees that are responsible for testing are the primary feedback stream. We never see leaks at that level. When a leak occures, the development engineers have already moved on.
Are there Research in Motion employees empowered to monitor the various internet sites for input? Nice job description...
RIM is definitley here, I was thinking about this after I got my Tour, for the longest people have been putting all black housings, keyboards, trackballs on the Curves. The "All Black" or "Murdered Out" look is the most popular. The Tour now sports a black keyboard, trackball, housing. See what I mean?
from a software developer point of view for an OS in general:
RIM probably has their own user centered design/usability group for an OS (and hardware) that is still in development. The feedback in-house has just as much info, if not more, than what we can provide. Add to that a control system on tracking issues and people devoted to QA...CB has little to offer IMO.
However, for existing OS builds (not leaked) there might be some benefit from pulling user problems with the OS from CB.