Custom button for IBIS on/off?

[xoda]

I find a hassle to constantly have to turn IBIS on/off depending on whether I'm using a tripod. Is it possible to have it be toggled by a custom button? I looked through the menu and didn't find anything - so I just wanted to make sure if it's possible

[Helwin]

Unfortunately it´s not possible to assign a custom button. It´s on the wishlist...