Cool tutorial, I don't agree with your approach though, it seems pretty awkward and slow :/... Few things, when you shifted the whole section earlier and were worried that it wasn't on the grid anymore, you didn't have to trim the start. You could have just made your selection on the grid lines, even if the audio isn't on the grid lines. Also, the hand with the arrow isn't "Add new trigger", it's "Promote Trigger". To add a trigger you just click without holding any modifier keys.
There also seems to be a lot of guess work and fudging around with things, like you have no idea what BD is going to do until afterwords and then you are troubleshooting to try and figure out what went wrong... If you enable "Show Trigger Times" it makes it really simple to see what is going on before you hit conform and also makes it obvious why it isn't catching certain triggers and stuff.
Either way, sorry to be so critical, it's still a great tutorial and thanks for putting so much time into it, will help a lot of people for sure. I might make a tutorial of the "Murphy Method" that I use, it's a LOT different to your approach so maybe it's worth having a video for. Cheers dude!
