Pocketbook 626: Changing zoom-factor of PDFs in column-view

[Aquan]

Hello,

I'm looking for a way to change the zoom-factor used for column-view when reading PDFs with my Touch Lux 3. Right now, the zoom is fixed to 200% when reading a 2-column page and 300% when reading a 3-column page. This means, that I have to crop the margins exactly at the right pixel or else the columns won't fit the view.
It would be much easier if I simply could change the zoom to, for example, 175% for 2-column-view and 250% for 3-column-view. My old Sony PRS-T1 did it like that.

However, the zoom is fixed in the GUI, I can't change it. Is it possible to change it by editing some confg-file, or is there maybe an alternative pdf-viewer available that allows this kind of change?