Compare the Eclipse keybindings on Mac OS with actually running Eclipse on Mac 
OS.  Eclipse on Mac OS does the same thing we do on Mac OS - bind most Ctrl-
based shortcuts to Command [META].  For example, Command-Z is undo on Eclipse 
on Mac OS, but Ctrl-Z is our binding for undo on Mac OS.  Which means that on 
Mac OS, we don't actually have Eclipse keybindings - they won't match the 
habits of an Eclipse user.

This can be solved very simply, assuming you're defining the keybindings the 
standard way using Utilities.stringToKey()/keyToString() - just define the 
bindings using D- for Ctrl bindings and they'll automagically be bound to 
Command on mac;  use O- for Alt keybindings and they'll be bound to Alt on 
PC's and Ctrl on macs.  E.g.

CS-O == Ctrl-Alt-O everywhere
DS-O == Ctrl-Alt-O on PC's and Command-Alt-O on macs

AS-O == Alt-Shift-O everywhere
OS-O == Alt-Shift-O on PC's and Ctrl-Shift-O on macs

(remember Alt is not usable as an accelerator on macs)