The patent is for a little more than that.
http://www.google.com/patents/US5920303?dq=5,920,303
It looks like Speak for Yourself ran afoul of it here: "...and control means for comparing the temporarily stored symbol sequence, in response to each key selection, to a plurality of prestored symbol sequences, each including at least one symbol in a predetemined sequence,
and for dynamically redefining symbols of less than all of the plurality of displayed keys of the integrated input and display device in response to the temporarily stored symbol sequence matching at least one of the plurality of prestored symbol sequences." (IANAL)
That said, I still think the situation sucks, and I hope that the parties can come to an agreement that benefits everyone.