Multiple hotkeys for a single action

[Doxxer]

As XNView user I am used to have two key to switch to the next image. It has always been 'spacebar' and 'pgn down'. Backwards it was 'backspace' and 'pgn up'. This has been quite reasonable, because while presenting it was convenient to use the keys of the numlock and while sitting dirctly in front of the laptop, hitting spacebar was good.

In XNViewMP I miss this right now. The extra configuration for the spacebar key binding has been removed and using self defined hotkeys, I can just choose a single one. When changing 'next file' to space, 'pgn down' is not working anymore.

I would not like to have either or. Is there a way to configure the application to have both keys working like in the old times?

Thanks in advance