You should be able to disable it by setting up a servlet with the same servlet name in your web.xml. If that does not work please submit a bugzilla issue.
Also, what kind of trouble does resource servlet causing you?
Can you please explain how jsp servlet or resource servlet gets in the way of Tiles? I have not used tiles since Struts days and have not kept up to date with it. As far as I remember - tiles only wanted an "initialization" servlet that does not map to anything. You would still need a "jsp" servlet to render the pages.
We are currently doing "stuff" to snaps - so cases like that would help to test the changes or help us adjust approach. A simple use case snap bundle would help a great deal also.