I posted a version of ipdf (with 2-column view) that solves this flipbar problem by mapping both long and short flip to single page turn, and use UP and DOWN arrow for 5-page turn. I'll find out the link and post here in a few minutes.
Update: the link is here
ipdf, continuous mode and column view, the download for the above mod (plus modified contiinuous mode) is at post #13.