Not really a wordpress question – but have you tried
tinyMCE.init({
..
custom_shortcuts : false
});
??
(might have a problem with IE though , on which case, you can override them with a foo function.)
function disableShortcuts(){
tinyMCE.get('elm1').addShortcut("ctrl+b","nix","foo");
tinyMCE.get('elm1').addShortcut("ctrl+i","nix","foo");
}
after that you will need to add the “foo” command to tinMCE:
tinyMCE.init({
//your other stuff
oninit : "disableShortcuts",
setup : function(ed) {
// Register foo command shortcuts
ed.addCommand('foo', function() {
//foo function does null
});
}
});