I wrote some scripts to do that, not perfect by any means but they will do what you want.
I haven't used it in forever so I'm not sure if it works with recent rb versions.
http://www.webupd8.org/2011/02/script-to-synchronize-all-your-lastfm.html
https://launchpad.net/rb-mergeplays
If that fits your needs I'll work on it this weekend.
Hi,
I am not sure if this is the proper place to make a feature request. I found some requests in the archives for this list so I hope it is ok.
Similar to what http://askubuntu.com/q/210090/19490 is asking for I would like to request the ability to sync songs with a particular ranking in the Rhythmbox database with loved songs on Last.fm. For instance, it would be very nice to have Rhythmbox collect ones loved songs from Last.fm and mark them with the highest rating so that one could easily find and play them in Rhythmbox.
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