Change Tab switch hotkeys

[ChromeBeauty]

Hi
Is there a way to change the hokeys for switching between tabs?
I think in the normal XnView it was simply F8 & F9 I would like to use it here too, but it seems the latest XnView MP just has Tab+Ctr and Tab+Ctr+Sht what is simply too circumstantial for me.
I searched the menu for hotkeys but couldn't find any entry where I can set a hotkey for switching tabs, is that now "hardcoded"?
Cheers