Re-mapping PgUp and PgDn on PC keyboard

I have a setup where I use the same (PC) keyboard for my **PC** and my **Mac mini** using a switch box. I switch back and forth between the two all the time - and in order to stay sane I have re-mapped many of the Mac shortcuts/keys using the **Karabiner tool**, so they function as they do on my PC (keys like Cut, Paste, Home, End, etc... ). But I don't seem to be able to find a mapping in Karabiner that makes PgUp and PgDn work the same way on Mac as it does on PC. When I press PgUp / PgDn on Mac it scrolls the page, **but don't seem to move the cursor**. Funny enough - if I press ALT (Option) + PgUp and ALT + PgDn it does exactly what I want. **So basically, how do I get the PgUp to work as ALT + PgUp and PgDn to work as ALT + PgDn?**