Sounds interesting but we currently don't log or analyze any of the keystrokes. We just move a pointer in the config file and then dump whatever is there based on the release of one key in the chord.
Also, there really isn't any RAM onboard to work with. We do everything in the twiddler.cfg file. So if we write the "marked" word out to storage, it will be there until deleted. A simple power cycle would not be enough. This could be an issue if someone puts in their credit card number or password as a marker.
Question: How much do you want the Twiddler to know about what you are typing. Currently, if its not in the .cfg file, it doesn't know about it. We could make it much smarter, do analysis on what you type, optimize letter and word placement in the chord table, but it all comes at a cost of performance and privacy.
Why not just use letter markers like XX, XY, and XZ when typing and then just do a "find and replace" when you are done?