Behaviour of setWatch on pin X after pin X has been set with digitalWrite

I had a doubt about it, but after a quick check, it seems that a setWatch remains active until it is explicitly cleared by clearWatch.
BTW, @Gordon, are you planning to implement an additional configuration of an IO, that could be set as "digital output, open-collector (== open-drain)" ? This is largely used in the low-level sensors<-->MCUs interfaces (typical bidirectionnal lines).
I believe this may be done by using some low-level function such as peek() and poke(),but this is a kind of dangerous method, as the memory does not seem to be protected at all.