Hi Scott,
You have always had that ability in the Custom Control -- however the way it works is via the Insert Special Menu.
So when you start Recording a Custom Control and you want to insert a "state" behaviour you go into the custom control menu (if you were taken elsewhere during your recording) and then select the "Insert Special" button. Inside of this is other menus, you want the Special menu. Scroll down till you get to the Cut or Trans Keys functions -- you will be able to pick the keyer(s) and the state that you want to set using either a Cut or a Trans based on the function you have selected.
I use these all the time in making Custom Controls for Transition effects.
Les
#Vision