Post Type Plugin?

I downloaded the beta for 3.1 earlier today, mainly to mess around with Post Formats. They aren’t enabled by default, apparently, so you have to register them in the functions.php of your theme like so:


add_theme_support( 'post-formats', array( 'aside', 'gallery' ) );


I obviously don’t want my site’s functionality to depend on a theme, so I tried registering all the post formats with a plugin. But that hasn’t worked. I suppose I could use the plugin to write to the theme’s functions.php, but before I do that, I was hoping someone might know a way to register post formats which is entirely independent of the theme.