What you can do with your PhysGun (as far as I know) ~While holding an object with your Physics Gun:
-Press Right Mouse Button to freeze (If you are using Magic Mouse, you'll need to go to options then to keyboard, find Secondary Attack and change it to something other than MOUSE2)
-Press and hold E to rotate
-Scroll the Mouse Wheel to push and pull an object.
-You can also hold E and press W or S to push and pull objects (Thanks, Doomstick)
-Hold Shift and E while holding a prop to snap to angles. (Thanks, |TTG|Indah)
~While looking at a frozen object:
-Press R to unfreeze (Double tap R to unfreeze everything, you don't even have to look at them!*) *(Some mods, such as the Unfreeze Delay/Warning mod will not allow the double tap to work)
~To change the color of your Physics Gun:
-Hold down your context menu button (default C) and click the player model button, there should be an option/tab that says color. From there you can change the player model color and the Physics Gun color.
~To change your Physics Gun speed:
-Open your console (default `) and type physgun_wheelspeed <number> (e.g. physgun_wheelspeed 500)