the best option would be to assign an hot-key in the Config.xml <DEFAULTMETATAGS> section calling a special (local?) page to do some maintenance, like give an option to reload last page, logout etc.
You can find attached a showkeycode.html sample that helps you finding the correct keycode of the characters you want to intercept.
In config.xml you need to put then something like:
<DefaultMetaTags> <MetaTag value="KeyCapture~KeyValue:0x79;Dispatch:False;KeyEvent:url('http://localhost:8080/Quit.html')"/> </DefaultMetaTags>
you just need to replace the KeyValue with the one you want to intercept, and the link with your own page. Attached the quit.html sample that ask for THE password to exit the app... "symbol" :-) .
Another trick is to leave the BadLinkURI empty, this will make RhoElements asking to reload the page.
usually the debug buttons are not validated to be used in production.