Version 1.6.5 is updated ! 
-
Added Free-hand drawing ! Now when you press U key to turn off snapping, you can hold down mouse Left button, to draw free-hand line ! Just hold down Left button and draw. (only in snapping off mode)
-
Blender’s boolean is limited, and it does not handle very well for shapes with such large number of vertices… so free-hand drawn shape always fail for boolean cut. Please use create-face mode.
- Now if you do not have mouse-wheel for scrolling, you can use keys !! You can two keys “-” and “=” keys (in fact it is “plus” key), for scroll up and scroll down. For example, when you want to change grids count, you can Ctrl + scroll wheel, or you can Ctrl + “=” key now.
Grid count = Ctrl + “=” or Ctrl + “-”
Grid plane size = Alt + “=” or Alt + “-”
Bevel count = just press “=” or “-”
Array count = just press “=” or “-”