Modified ipdf-svn23-rjenhanced070612 to have an columnadvance function on the toolbar. It works like this:
- select continuous mode
- zoom in on the column
- toggle columnadvance on toolbar (I nicked the start_reading icon)
- mark column width with stylus
- use flipbar to advance
- both columnmode and width are saved in the manifests

I whipped this up quite quick and there is a lot I don't like at this point:
- renderThread will throw the page you are looking at away because it is the oldest in the cache
- cpu throttling seems unaware of renderthread actions
- zoom on the column and mark the column should be one action, but the zooming makes the columnwidth imprecise
- algorithm to determine if there is another column or not has too many knobs in it still - doing the right thing is hard without actual column detection. portrait works ok, but landscape is "hard to enjoy" :)
- portrait and landscape algorithm should be merged (they are equivalent)