I'm running DW games with the Errata rules, so the weapon charts on the GM screen (the one in the GM kit) don't do me any good. I don't know if anyone else does this, but I instead popped open photoshop, and have covered those charts with other reference pieces - in my case, one chart was covered with a paper detailing the names of the characters and their corresponding players, and a larger chart now details the Space Marine's default abilities, resistances, re-rolls etc. so I don't forget them.
I thought it was a nice way to reduce my loose paper count and maintain the usefulness of the GM Screen.