it just occured to me - could you use the external mouse with a ps2 -> serial converter and as a serial mouse? I'm sure if you don't have one lying around you could pick one up for a buck or two at your local radioshack or computing store.
just another possibility. A bit of an unfortunate workaround, but if the other solutions don't work - this at least would. ----- This email has been sent as a single line of query, and in no way indicates the senders interest in or acceptance of any promotions or "opt-in"'s unless otherwise EXPRESSLY noted.