Was thinking that the answer to the original question might be to make the control criterion the same for a rideout as for a takedown. Since holding an ankle wouldn't constitute a takedown, give the escape at that point and wrestle on.
I can't recall ever seeing stalling called in the 30 minute overtime period.
I definitely have, more than once, but obviously nowhere near as much as it should/would be called during regulation.
If the score is tied up at the end of regulation the person with the cooler shoes should win automatically.