Titanium coffee cups are great if all you ever use is a gas stove. Previous experience has proven that titanium cups over a wood campfire do warp after very little repeated use due to much higher heat that wood fire coals can reach compared to some petroleum based fuels
IIRC, titanium is a very poor conductor of heat. If its not heated evenly the Ti will probably warp due to the temp difference. That can happen easily with a those pocket butane stoves too cause they put out so much heat in a small burner. Anyway, I guess with Ti it might help to heat the pot as evenly as possible, but even then there's no guarantee it won't warp. I've never had a problem with warping but thats may be because I use an alcohol stove which doesn't burn too hot and heats slower.