Bramble caught on pretty quickly that if she bit down on my hand, tug stopped.
We used tug as a reward when she would alert to the bus. We've dropped that reward, but Bramble will still put her mouth around my hand-with out biting down. Now, Bramble is never allowed to bite, because of her job; but the point is I think if it works for you and your dog, then do what works.
Which I guess leads into a thought I had recently. I most definitely believe in training. For us, training is a life long commitment in order for Bramble to keep working and learn new tasks. We work with a professional and will for the rest of her life. But my son is a better handler than me. No rewards, no tools, no toys, pfft no commands, and still she does what he wants her to do. The only time she won't is when he is getting ready to lose it (smart dog). So, he doesn't use tools and techniques the "right way", but that actually seems to be his strength as a handler. He doesn't sweat the act of handling. He just does.
Lately, I've been trying to emulate his style (well, except I'm verbal

. I've tried just doing, instead of worrying about the techniques and tools. Bramble has learned three new commands and it was just so easy and natural.
So that is totally irrelevant, but where my brain has been going lately.