Probably the reason you haven’t found much is that we don’t have much!
1) we don’t know
2) we don’t know
3) more skin to skin than secretions, but I wouldn’t completely rule that out
4) There is debate, yes. And if you are having sex with someone who already has oral HSV 1 (cold sores) they are not at risk. My feeling personally is that you should disclose because if this turns out to be a long term thing, it will come out and they may be angry that you did not disclose.
5) no, we are not.
Please feel free to ask two more questions/posts, knowing that I may not have the answers that you seek.