Any way to bump up the default walk speed with this mod?

It was fine when I started but my base is a lot bigger and it takes forever to get anywhere.

You can switch to radar mode and do everything from there. Then you can zoom out and pan, which drastically increases your pan speed.

As for changing the default, that's an interesting problem. Radar mode solves this by letting you zoom out and then panning over the zoomed out version at the same speed. There is no clear way to conveniently adjust the pan speed in non-radar mode.