[DiapDealer]

Calibre doesn't know all the pecifics about plugin configuration and/or support files. Only the plugin itself would know all the details necessary to remove itself entirely. I suppose it wouldn't be impossible to create a cleanup framework that calibre could run at plugin removal time, but it would still be entirely up to the plugin developer to provide a valid manifest for that cleanup routine. Sounds like a lot of work for something that couldn't really be enforced anyway.

Don't get me wrong, I'm not opposed to a cleanup option, I'm just not sure it could be accomplished short of calibre monitoring every run of every plugin to record any files that might get created by plugins.