"Do you think I should move myself to the divorce-busting boards?"
No way, keep it here, among friends.
"Every thing that she says in front of her stepkids, every thing that she does in front of her stepkids, etc., gets reported to their mom, my ex...."
Real easy solution here. She needs to watch what she says around your kids. What kind of adult bitches and fights and complains in the presence of children? That's crazy. Of course your kids will report to their mother. It's up to your wife (and you) to make sure they don't have anything ugly to say.
"Well, she is putting me in a position where I have to choose either my 3 kids from prior marriage, or her and DD3."
I hate to say this Hairdog, but reading your posts always makes me feel better about my own wife. I mean, my sex problems are just as bad as yours, but your problem seems so deep. I never feel my W doesn't love me, despite our troubles. But I wonder if you aren't just wasting time trying to make it work. I don't think Mrs. Hairdog wants it to work. Please note that I am wholly unqualified to offer marital advice to you or anyone else. But hey, you asked, so there it is!
"Now she's really playing dirty, fighting in front of the kids, belittling me in fromt of them, saying outright that she will make my life hell and give the kids lots of things to tell their mom about which could give her grounds to ask for full custody."
Would you act that way towards someone you loved?
"Yes, I am living with an alien."
Tough to argue with that.
- Paul, who is not a phychologist, does not play one on TV, and has never stayed at a Holiday Inn Express