From Game Editor
First, download the Sprite Maker Beta tool made by Feral: http://game-editor.com/forum/viewtopic.php?f=4&t=5869
Use it to create your rotated sprite frames, then add them as an animation.
Actor>CreateActor>ScriptEditor>
ChangeAnimationDirection("Event Actor", STOPPED);
Actor>DrawActor>Script Editor>
angle=direction(x, y, xmouse, ymouse); //test angle animpos=angle/360*nframes;
nframes is a variable that equals the number of frames in the animation.