Is it possible to set custom shortcuts show up in the cheat sheet shown by holding <super> in unity?
Solution 1:
If you edit key-bindings using CCSM -> General Options, the updated settings will show up straight away in the Cheat Sheet.
If you want to add new key-bindings you can do this in CCSM with the Commands plug-in, these won't show up in the Cheat Sheet.
It seems that the Cheat Sheet only reports specific key-bindings from the list, you could change that list if you want to go into the source and rebuild it, then integrate it back into your system. You could suggest it as a feature on the unity page in launchpad