The "Scale & Rotate by Line" command:
This command scales and rotates an object by clicking on the start point and end point of a reference line then, a third click defines the new endpoint of the line.  The object will then be scaled and rotated (about the line's starting point) to fit the reference line to to the new end point.

NOTE:  This command was designed to be used on bitmap objects but should work on others as well.  Rotated bitmap objects will not scale in vectorworks with this command - These objects can be rotated back to "0" in the Object Info Palette to make this command work on them.

WARNING:  This command has not been extensively tested so use at your own risk.

OPEN SOURCE:  This command is open source.  If you find ways to improve it, please send me the updated command.  This will allow me to post improved versions of it on our website.