I just finished implementation of two-column zoom mode which is very useful when reading articles on kindle (and frequently requested in this thread).
When you press F, you will be zoomed to top-left column of page. This will also switch you to pan mode, so you can use fiveway to move up/down in current column and left/right to switch columns (and change pages if needed).
Pressing left will always position you to bottom of previous column, while pressing right will move you to top of next one which is consistent with reading flow (even when scanning document backwards).
At any time you can press a/s/d keys to get whole page overview and exit pan mode.
Until changes are merged to main repository, you can download new version at: