Hi Tom - yes this is possible by going to Options / Shortcut keys. Press the Add button to add in a new entry and paste in the following new shortcuts:

Key	Command
G	script:moi.drawingAids.gridSnap = !moi.drawingAids.gridSnap;
S	script:moi.drawingAids.straightSnap = !moi.drawingAids.straightSnap;
O	script:moi.drawingAids.objectSnap = !moi.drawingAids.objectSnap;

Then when you push G, S, or O you should see the orange highlight on the bottom toolbar for each of those buttons turn on and off.

Hope that helps!

- Michael