So is there really no way to bind movement + attack to the same button?

I installed Last Epoch yesterday and my attacks were mapped to my right click while movement is mapped to my left click but it’s physically impossible to map both of them to the same button.

I know this sounds really petty but this is something I’ve just gotten used to with Diablo and PoE and Grim Dawn. I use my mouse for part of my interactions with the game. It’s not optimal but it’s how I play.

Did I overlook something or is this just how it is? What did you map that tricky button 5 to?