In Modo you can make inactive Meshes either Wireframe or the same as the active Meshes. This usually involves going into the 3D Viewport Properties via the ‘o’ key, you can assign a shortcut but what if you want a shortcut that toggles the behavior well you can do that too by using ‘?+‘  which is the toggle instruction for all boolean commands.

So in the Map to shortcut dialog use this instead of the given TRUE or FALSE

view3d.sameAsActive ?+

Select you preferred key and off you go.