Queue display: what's with the Radio entry?

On the queue display, there are several functions indicated with a discreet icon: repeat, random, transfer. But Radio gets a whole panel that explains the semantics.

That is unseemly.

Sure, Radio is less common than repeat and random, but not than transfer, and in any case there are ways to bring up the explanation on a hover or something.

Plus it isn’t clear how Radio relates to the two Repeat modes…