Well, I have the Dectalk USB, and it does this sort of thing. It's pretty annoying when it gets abbreviations wrong. I remember that JAWS for DOS could turn off the Dectalk abbreviations, but JFW can't. The Accent PC also has abbreviations, but apparently Speakup knows how to turn them off. Probably the best option is to have a command that can be sent to the synthesizer to disable abbreviation processing. I also agree that such processing should be case sensitive.
