Is there anyway to view the source of a web page on mobile Safari in iPad via the home screen app button? because this obviously hides the address bar etc..
No you can't view source in Mobile Safari full-stop.
EDIT Have you checked out the remote debugging tools that are out there? Whilst you won't necessarily be abel to view full-screen web app source on the device itself, you may then be able to view the source on the control device. For example, weinre