How to bind F1 key as custom shortcut?

[seanh <snhmnd gmail com>]

Hey, I'm trying to bind the F1 key to run a custom script. I'm able to
do this with all the other F keys, but in the Settings app F1 opens
Help, so I can't press F1 in the Settings app to bind it.

I've looked for the keyboard shortcuts for the Settings app in dconf
and gconf, but I couldn't find them. I also looked for where the
custom keyboard shortcuts are saved in file so I could edit them
directly, but couldn't find them.

Thanks