Some notes after creating a basic mobile tool using Drupal. Not exhaustive research but could be handy to someone trying to do the same.

Created a new theme got rid of all regions bar $content.

Also as we didn’t need them for the app, commented out tabs.

Even if you keep all content in a page small it looks like webkit will still zoom out by default. <meta name = "viewport" content = "initial-scale = 1.0"> sets the zoom level to 1.