Plugin Deletion

Hi if I delete a plugin through the WP admin interface, does it delete the corresponding plugin folder from disk? If so, can there be a clear indication in plugins.php, that the disk space is released when deleting a plugin?

By the way, while I can delete plugins from the WP admin interface, I do not seem to be able to delete themes from the interface and the only way seems to be directly deleting the corresponding themes folder from disk. I would appreciate if the facility to delete unused themes is available from the WP admin interface itself. Also make it clear that deleting a theme frees up the corresponding disk space.

Also I couldnt find a way to get email notification of threads I started on the WordPress support site. Am I missing something? All forums that I have come across, usually have this option.

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