Change input for move view conflict with spacebar and 2 button mouse


I have a 2 button mouse and use the 3 button emulation via the ALT-key on my mac. I don’t like the input SHIFT+ALT+Left Mouse for moving/panning the 3d view. I would like to have Spacebar+Left Mouse as the hotkey.

First I deactivated the search field command which usually lies on spacebar and then I changed the move view tab under 3d view global to spacebar and left mouse. It doesn’t work though. I did manage to change other shortcuts though, so I guess there is some sort of conflict with my mouse having only 2 buttons or maybe just with the spacebar.

Any ideas? Thanks.