Being a PC gamer and modder, I had the ability to solve this problem in a manner outside the game's boundaries, lengthening the period from 3 minutes to 10. I also http://www.newvegasnexus.com/downloads/images/41911-1-1305943470.jpg to illustrate my aggravation when I released this mod for everyone else. Almost all the comments on the mod I released was people saying stuff like "Finally!" or "Beats my solution: a shotgun to the face", or "Can you make one for Dead Money too?"
Since there seems to be a delay for Lonesome Road, could you take some time to lengthen the period between any banter for any companions in it?