How can we improve the Roto Brush tool and Refine Matte effect?

If you use the Roto Brush tool and/or Refine Matte effect, let us know how you're using it and what you'd like to see improved.
(We'd especially appreciate it if you gave feedback after you've had a chance to learn how to use the features and try them out on some real work.)
Normally, we like to encourage feedback through the feature-request form, but in this case we'd like to get a more public conversation going.

Hello,
I've been using the Roto Brush and so far I am very impressed.  It is much more stable than I anticipated and gets me pretty far with much less work.  I'd say I can get my shots 85-90% of the way done with the Roto Brush tools, in a fraction of the time.  Bravo to Adobe for such a great tool.  I have however, hit one major snag.  I am part of a pipeline and I need to render out my mattes and pass them up the chain.  When I look at my Roto Brush precomp it is beautiful, the motion blur is perfect and the alpha looks identical when I check that out.  However when I render out my tiff sequence and pull it back in to check it, there is bleed in the motion blur.  I'm not sure this is a roto brush problem because when I look at the alpha of the roto brush layer and the rendered matte they appear identical.  Any suggestions on how to get the bleed out of the blur?
Thanks,
Danielle

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