How can I set a custom hotkey shortcut for vertical scroll up and down on an image?

[SuspiriaSunset]

Hello everyone. I am using XnViewMP 1.7.2 on windows 11. I was wondering if it would be possible to add a custom hotkey shortcut for vertical scroll up and vertical scroll down while viewing an image. Currently these commands are by default bound to the up arrow and down arrow keys on the keyboard. I would like to change this command to a custom key.

I exhaustively looked through all the available options in the shortcuts menu, and sadly I did not find a vertical scroll up or down option, so I can't seem to make my own custom hotkey for this functionality.

Would it be possible to add the ability to set your own custom hotkey for vertical scroll up and down on an image? Thank you very much and please have a nice rest of the evening.

[user0]

related
Settings - interface - keyboard - add modifier keys (B)