Use colliding, behavior off on start, and when done, behavior on on the colliding.

No, I don't, but that's something that I need often, and I feel many people could use, so it's definitely worth a multi-person researching and development team. I haven't found anything useful on the arcade aside from move to object, so if I have to solo build, I have to solo build, but it needs done at some point regardless.

I'll email you shortly.