I think there was a misunderstanding. I didn't just want to have that speech is supported for DisplaySpeechBackground, but I also wanted to have the possibility to switch on the option that there is a talking animation. In other words: The same command as DisplaySpeech but without blocking.
Sorry, when I didn't tell it enough clearly last time.
I've just uploaded a script that performs the similar thing to what you are asking, just in case it helps: http://www.agsforums.com/yabb/index.php?board=2;action=display;threadid=11868
~Cheers
CJ isn't here, though. Would it be possible for someone to whip up a quick plugin?