Hi and Welcome to the Community...and apologies for the delayed reply.
First -- this site isn't really a place to make suggestions to RIM...this site is a user-to-user community, not a user-to/from-RIM channel for communications nor support. Hopefully, though, they will see your suggestion and consider it.
But...I am having trouble understanding your exact suggestion. For instance, if by "streams", you mean email, then the email app has the ability to combine all configured email accounts into an integrated inbox. Indeed, with the newer BB models/OS levels, that same inbox can also show incoming items from FaceBook, Twitter, and other channels. Some folks prefer the integrated approach, others prefer the segregated approach...fortunately, the BB allows one to have either that they prefer!
But, perhaps I misunderstand what you intended by "streams"...if so, clarification would be useful.
Thanks and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
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