MovieClipLoader and passing variables

Hello all.
I’m looking at the MovieClipLoader class, which seems to include a lot more functionality than loadMovie(). However, the one thing it seems to be missing (and the only thing I absolutely need) is the ability to send variables (using either GET or POST) to the new clip. loadMovie()'s third parameter is an optional string that specifies which HTTP method to use to pass variables, but I don’t see any equivalent in MovieClipLoader.

I’m wondering if there’s a way that I can pass variables to my new movie using MovieClipLoader. OR… Use loadMovie(), but still have access to methods like onLoadError() and onLoadComplete().