Advanced path/spline editing in Flash

Greetings! I’ve been toying around with some new ideas lately and I’m curious: can anyone think of a good way to do advanced path functions, like boolean add or subtract, in Flash? For example: the Pathfinder functions in Adobe Illustrator take multiple objects as inputs and perform some function that results in a new, single path. Imagine this scenario: You have two different size circle movieclips floating around, and when they combine they become one new path. Anyone with me here? How can we do this in ActionScript?

–v_D