Well what are you testing? Are you testing the final product? Or are you testing the game in a debug version? If you're working with a final product, then a good macro record/playback tool is always nice to have. It can automate some tedious work.
Other than that, if you wanted to automate anything else, you may need a more specialized tool to deal with the flash itself.
It all really depends on the state of the software I guess.