imagecache preset saved by name instead of key

In advanced_forum_settings_page() we have

    $options = array('' => '');
    $presets = imagecache_presets();
    foreach ($presets AS $preset) {
      $options[$preset['presetname']] = $preset['presetname'];
    }

If I happen to rename an imagecache preset, advanced forum "breaks". I have to visit this form again to reset the advanced_forum_user_picture_preset variable to the new name. I propose the variable be changed to store the imagecache preset id, rather than the name.

    foreach ($presets as $key => $preset) {
      $options[$key] = $preset['presetname'];
    }

We'll then need to get the preset name using imagecache_preset($preset_id) wherever we use the variable. And of course write an update_N function. Anything I'm missing?

If we agree this change is needed, I'll volunteer to write the initial patch.