You can define a button on the same space of the album art and it should work through it. If not you have too old of a RR version.
Flash objects can be clickable -- just look at the iRunner skin for instance, most of the buttons are flash. This has to be done IN FLASH. If your flash object has transparent areas, any buttons you define should also work (if you click on the transparent area).
The latest RR patch is available at: http://guino.mpug.co.uk/rr.exe
EDIT: Actually, I just took a look and this used to be there for the album art, but was taken away at some point (for whatever reason).. I have just fixed the above patch to work with it again.