I'm not quite clear on what cheat sheet means: hard copy? (as in crip note in your pocket or tethers to wrist or tripod?) But your question does give me an idea: 

 - Snap images of pages (or smaller) in the camera manual (say, one snap for any page/list needing to be referred back to later while shooting. Then...
 - Keep these stored in the camera's "memory" card. (My camera also lets me
   organized shots and clips as a searchable album.) Then, whenever I need to cheat...
 - Push playback;
 - (Invoke album);
 - Find page and memo info;
 - Tap shutter;
 - Make setting change; then,
 - "Voilà!" Back in business.

Eventually it should even be feasible (and provide some fun) to include or contrive good-shot results (complete with full shot-settings info overlay) that illustrates settings for particular shot effects, to be stored as my camera's "in situ" manual-shooting guide. 

Hmm! I can see it now. Out with Camera Owner Manuals. In with CamIntegral Manuals. Remember, you saw it here first !