I have some modules that alter the theme registry. In practice, I could limit these alterations to only some themes. On a site with multiple themes, my modules might need to alter only one or two. However, I can't figure a way in code to determine which themes might need these alterations. Ideally, I could allow the administrator to select one or more themes which will be used. Either by selecting the themes in a form, or possibly by adding something to the theme's .info file. Is such a thing possible. In particular, how can I ensure that the theme registry will be rebuilt after the administrator submits my form or edits the .info file? Is there a best practice along these lines? -Dave P.S. too bad drupal doesn't support post-process functions in theme...