It would be cool if it was just a specific "feature". But I feel like you have more control using fade envelopes on the Opacity slider. Which is discussed on this thread.
viewtopic.php?f=6&t=17876&p=74013&hilit ... oop#p74013
Only downside right now is it has to fade to down and then back. That is where some overlap would be handy. So yes, it is not a true "cross fade" yet, but very close.
A handy tip is that you don't have to go down to 0% opacity, so its really not too bad the way it is.