Jean,
I realize there are a few things above FMOD on the Trello TO DO list, but really there isn't much Playmaker can't do with regards to making a legit game, except for support for professional interactive audio tools. I can't imagine that building Playmaker actions for FMOD is that big of a task at all, as I know that the engineers I work with claim it to be extremely simple and requiring only a few lines of code to get started. This would bring Playmaker into the audio community in a big way. I've been waiting on it for literally over 2 years, as Playmaker is one of the only options for non-code-savvy audio designers like myself for making a game.
Again, I'm sure this would be a quick task for you, and would bring so much functionality and applicability to Playmaker! Please bump it up on the TO DO list!