You might also try using the old key commands editor "Setkeys 1.3" used to display and edit the Commands.cfg equivalents in SH3 and SH4.
Although the program is from back 2005 or 2006, I tried it with SH5, just entered the path for SH5's Commands.cfg in Setkeys, and, voilá, it shows all commands by their names as well as their key codes. The key entries for any command can easily be edited (or added or removed) in a nice graphical interface, which includes a virtual keyboard.
The 's' stands for Shift ('c' for Ctrl) and is automatically added when editing/adding a key combination (e.g. Shift + x) command with Setkey's virtual keyboard.
If you have trouble googling&finding it, you can PM me.