This may well be a stupid question (please forgive my ignorance), but is it possible to use AJAX of the 9600/9400? There is a program for Mac OSX that sets up AJAX remote control of many functions ([Link: iospirit.com]).
I know that it may not work as currently designed (since the interface is for the iPhone/iPod touch), but is the communication could be received by the Pronto, maybe the authors of this script could redesign the page to support Pronto.