I don't know if software can be made smart enough to resolve the conflicts, but if all I want to do is APPEND, that should be easy enough. My favorite idea (though I don't know how to code it) would be to let the user SELECT a place in the text where they want to insert.
But maybe this is overkill. I find that if 2 other users are editing the talk page, I better stop and read what they're saying.
Ed Poor