message filtering via ajax in 5.4?

[Alex Dean]

In 5.4, will ajax clients be able to specify per-subscription  
filtering rules when subscribing to topics?  I don't see any obvious  
support for this in the 5.4-SNAPSHOT amq.js code, but maybe I'm  
missing it.  Would be very helpful to have, and I'd be happy to work  
on the JavaScript side of things.  Is there support for filtering in  
the MessageListenerServlet?

thanks,
alex