I recently bought an aluminium crusader mug lid from laundich1 from http://www.bushcraftuk.com/ forum. The quality is outstanding, and it reduces boil times dramaticaly. This is it in action;
Also, I have figured out the ultimate meths solution for the stove (not a red bull stove). My mod is cheap, super easy, and non permenent. I'll be posting it up here when I can get some better photos. WATCH THIS SPACE.