I think I wouldn't do it. It should be documented, that the people are aware of it.
And trigger doesn't sound completly correct to me.
And jbpm 3 users know the signal, so the confusion is already there, better handle it by documentation would be my vote.
I'm kind of ambivalent. Name clashes can occur and trying to prevent that can indeed lead to other issues/confusion etc. otoh, good documentation would also take 1/2 a day probably.
+1 for leaving it as it is and document it
ok. i'll leave it as it is.