Copying Poses with Constraints in Blender

Often I find that I need to use the copy and paste pose buttons to get a smooth transition when animating a ChildOf constraint.  Blender's built in copy and paste pose buttons ignore constraints so I coded my own.  Basically select the bones you want, run the 'copy pose to buffer' script, then change frame to after your constraint influence has been changed and run the 'paste pose from buffer' script.  This way you can get nice smooth transitions across those constraint changes...