Customizing Button Scrolling for Manhwa

[pilipili]

Hi everyone,

I’ve installed Koreader on my Kobo Libra Colour and have a question about reading manhwa (webtoons). My device has two click buttons (up and down), and pressing the bottom one jumps to the next page. Since manhwas scroll top-to-bottom, the taller images often get cut off mid-screen. I’d love to tweak a setting so each click moves down, say, 30% of the page instead of skipping to the next one—allowing 3 clicks to transition smoothly to a new page. Essentially, a button-based partial scroll.

Any tips or solutions? Thanks so much for your help!