Tom, pardon my ignorance but I don't understand your point.
There are many ways and tricks to get the tee close to the preceding green, but the last thing I'm going to do is get into a liability issue. I've violated many rules but I'm not going to put anybody at risk if I can avoid it.
This isn't to say that you need a great deal of space between green and tee, you just need to be practial about it.
Hardly a month goes by when I'm not approached to provide expert testimony in a golf design/safety lawsuit. I rarely say yes.
My insurance is too expensive and my deductible to high to risk putting a tee on top of a green. I'll make you walk the extra 50 feet before I put you in jeopardy. That being said, if someone hits that horrible shot, and someone gets it in the eye, it's still going to come back to my insurance.