you mean like http://www.youtube.com/watch?v=62BtVoQYDlI
One thing good about that design, compared to my Evernew Ti pot lid, is stuff that falls on top of the lid will fall off and out. With my Ti lid, stuff can fall into the pot
Maybe you want water that condenses on the inside of the lid to fall into the pot, which the Ti maybe does better?
Maybe ideal would be the lid to be higher in the middle, lower next to the edge of the pot, a little higher going over the edge, and then lower so stuff that falls on top will just fall off.