08-28-2013 08:06 PM
Likely your best way to start would be in this thread:
I realize that it's in the Z10 forum, but it was started when only that device existed, and all BB10 devices have largely the same feature sets. You should review that thread (yes, it is quite huge) and see if perhaps your ideas are already covered.
There is no formal method for submitting your request...we all hope that BlackBerry folks read things suggested here, but such cannot be validated (nor invalidated).