I use a Razer mouse and keyboard. Razer mice let u reassign your left click so I can assign it to any key and then assing that key in Diablo to Force Move. It's a LOT easier to move around this way than assigning it to something else. I tried the mousewheel like a lot of streamers do, but I kept dying. Regular left click works natural.

Now, obviously u can't click objects this way, so I assigned regular left click to other mouse button. Also Razer software lets u have profiles and assign a key to load a certain profile. Whenever I want my mouse left click as usual, I press a key to load the regular profile. I can go back and forth from regular left click or force move left click by pressing 1 key.