goodeddie
I tried Lordshiva's boomerang capx, and it launches when you click the mouse button, but it doesn't adjust the angle or velocity in relation to the mouse motion the way you wanted...
Here is a sample I made for someone a couple weeks ago (it started as a project to show the dots for a trajectory, and ended up being an angry birds clone). You can launch red birds with the slingshot - it sets the angle and velocity based on how you pull it. You can also pick up a white bird and just toss it. It works with both mouse and touch (and works well on my iPhone). Obviously, you have to calibrate the velocity when you throw things to match how you want the gameplay to work...
http://www.rieperts.com/games/forum/angry_birds.capx