Hi. It would be nice to connect a second mouse to PC and use both of them in VR editor for navigation. When you move a mouse on the table, the pointer moves horizontally. If you hold right click while moving the mouse, it moves vertically. Scroll wheel changes the angle for the pointer line and left click selects.
Also, another controll method for two mice could be:
Right mouse movements - moves a 3D cursor horizontally
Left mouse movement - moves the 3D cursor vertically
By using the two mice, you could place an object anywhere in the 3D space with one combined mice movement.