I'm not sure I can explain this generically, so here is a case example:

The HUD forsees having buttons for GO TO "state" WHEN IN "state".

I am building step-through animations with, for example, step1, step2 .... step9 buttons for each state. My viewer, who doesn't know FC, is thinking in terms of actions, not states. Let's say he has just viewed the transition between state3 and state4. I would like to allow him to repeat the motion sequence he's just seen - by using a replay button located in state4.

This would mean having something like GO TO "this state" USING TRANSITION FROM "stateX(previous state)" in the HUD.

Don't know if it's do-able and it's only relevant for sequential presentations, so please comment if this is of general interest.