I've found that if using G187 and setting it to automatic, it doesnt post with every tool or toolpath. It also doesn't post a "P" value that makes much sense. There doesn't seem to be any rhyme or reason as to why it will post a "P1" or a "P3." I think it would be valuable to have the automatic function of G187 controlled by the tolerance that's input in the "Passes" tab.