Determines whether the mouse wheel zoom in paperspace viewports is controlled by specific zoom scales or independent of viewport scales (legacy behavior).
| Type: | Integer | 
| Saved in: | Registry | 
| Initial value: | 0 | 
|  
			  Value  | 
 
			  Description  | 
|---|---|
|  
			  0  | 
 
			  Off - mouse wheel zoom scales independent of viewport scales (legacy behavior)  | 
|  
			  1  | 
 
			  On - mouse wheel zoom uses the scales of the current viewport  |