Currently trying to implement AF_SetInMotion and ReplaceSetInMotion for
Plots That Span Centuries.. I'm getting a weird feeling of
Deja Vu about this bug I'm trying to squash where it's like the replacing ability gets run multiple times.
(If I replace one Setting Into Motion event with 3 SIM events, I get six SIMs in game. If I replace one with two, I get three. If I replace one with one, I get one.)
NOT REALLY EDIT: If I make the replacement an activated ability, I get 42 SIMs.

ACTUAL EDIT: Whew, found the problem. All previous schemes triggered on *any* schemes being set in motion.They didn't actually get set in motion again.
Non-ongoing schemes must from now on specify that they trigger on themselves being set in motion