Just tried it, great job!!! This is the one feature I have ALWAYS wanted in MC. I know consider MC to be complete in my eyes (though I'm sure I won't stop making suggestions for new features)!
If I play a song by double clicking it from the library, and then decide I want the Radio option, starts the song over. Hopefully it will simply enable that mode passively.
After the Radio is on, it is difficult/confusing to turn it off, remove songs, and start over. If I press stop, I can't remove the song. Only after I click play from the toolbar menu, can I remove the songs. Also the check box doesn't disappear after trying to uncheck it. The music stops if I do this, but only after clicking the Play menu option or playing a new song from the library, does it disable the Radio.
It might be nice to visually show the Radio option as ON in top Display that flashes something like 'RADIO' subtly next to the track data, maybe in a slightly different color shade.
If I decide I want to start a new seed song while in Radio mode, what is the best way to go about this? Can the Radio be kept no matter what I do until I click it off in the menu?
It seems to have a tendency to play the exact same song again, but only in smaller genre's I think (not sure if that is the reason)
Obviously I hope how it makes it's selections is somewhat user configurable with a settings screen like you showed in the first post. But I could imagine giving control such as a year range that the user could select 5, 10, or whatever. Same thing with BPM and Intensity. Also controlling how sensitive the Radio is to last played, skipped song data, and ratings are important.
Simplicity is nice with basic sliders, but allowing those fields to be specifically controlled would be great. For those of us who have Styles or sub-genres nicely tagged, I hope that is somehow weighted in (mine are the semi-colon type).