we're tracking your bug at https://bugs.adobe.com/jira/browse/FM-1187 . It will be prioritized by the team and you will see any change on it.
> Has dynamic streaming in OSMF been tested using stream aliases in FMS?
No, since the majority of the users do not use this setup. (http://forums.adobe.com/thread/532611?tstart=1 )
> Can I write a videoRx.com plugin for OSMF that overrides this method so the lookup behaves correctly?
I think that if someone needs this kind of redirection, the change should be done in the framework or player. A plugin might be an overengineering.