I can't be the only one who uses two crossed charcoal grates to keep tiny lump pieces from falling through when they are still red hot. I don't mind so much when they fall to the bottom of the kettle, but when I have a three zone fire going it drives me nuts.
I started doing this one day after I had a real busted bag of lump and half of it fell through to my ash catcher. Needless to say I could've cooked a ribeye caveman style in the catcher if I wanted.