The idea is to store mouth settings on a character and link them to words typed into a command-line. The rigging could be copied from a person speaking vowels, consonants and test-words. these could then be stored as presets.
The user can afterwards expand the vocabulary and ad more words to naturalize the mouth settings of the character , if so wished, fonetic visualisation of the word and a thesaurus could be incorporated in the application.
Furthermore the facial expressions that denote the demeanor of the subject (happy, sad, surprised,...) are saved and could be a subset activated by correspondingly labeled buttons (on which also could be expanded..).
Suggested name for this add-on : Motormouth