In AC9, the keyboard shortcuts are part of the Work Environment. They are stored at 3 Resources : Work Environment : RND Profile.
Keyboard shortcuts are customized at Options | Customize | Keyboard Shortcuts, Tools tab. The settings are saved in a preferences file called Archicad 8.1 Lasting.Prefs. The local version of this file is located at home : Library : Preferences : Graphisoft : Archicad 8.1.0 vn, where n is the current version.
Ours are fairly highly customized, and it's a burden for everyone to change them by hand. To save you the hassle, we keep a copy of the preferences on the server. (Quit Archicad before doing this, or no worky.) Simply copy the file from 3 Resources : Archicad Program Files : Good Archicad Prefs X : Graphisoft : Archicad 8.1.0 v1 : Archicad 8.1 Lasting.Prefs, and write over your local prefs.
Oops, it's not that simple. It used to be. For some reason, in AC8.1, a permissions issue has developed with Archicad 8.1 Lasting.Prefs, making it hard to copy. (The other prefs are OK.) Here is the workaround:
Duplicate the file in place. (Drag and drop it in the same window while holding down option.) You get "Archicad 8.1 Lasting.Prefs copy". Drag this file to your local prefs folder. Delete the old one. Rename "Archicad 8.1 Lasting.Prefs copy" to "Archicad 8.1 Lasting.Prefs."
Launch Archicad, and all should be well.