I was thinking about this. Since SPOT has two buttons (HELP and OK) that let you send a predefined message, in theory it should be possible to use it as a morse code transmitter. For example you could define HELP button as dot and OK button as dash (after all the HELP button on the SPOT looks like dot and OK button is longer in shape).
A person that would receive these messages could decrypt the transmition manually or I belive it would be possible to write some simple program that would take care of everything. The program would process the e-mails/messages, identified HELP messages as dots, OK messages as dashs and then it would translate the morse code.
For this to work effectively the SPOT would have to allow you to send messages in sequence, one shortly after the other. I donīt have SPOT so I donīt know how quick it is as far as sending e-mails/messages. Maybe someone here who has one could test it.
Some common words could be transmitted as aliases (shortcuts) like some people like to do when they write SMS. So it could save some time and effort.
Itīs just an idea. I donīt know how well it would work and whether it would be applicable or even useful at all but if you needed urgently transmit a special message via SPOT or just for fun it might be the way.