Not sure about 3.0, but for CB 2.6.3 you would need to modify the
onRequestStart handler in application.cfc to look for whatever file you
want in order to have ColdBox process the request. If you search
through the code for index.cfm you will find it is hard coded in a
number of places like requestConext.buildLink(),
requestConext.getSelf(), and the cache manager screeens.
It should probably be turned into a setting. I'm sure you could fake it
too with a URL Rewriting engine too.