The WolframAlpha Plugin is excellent when it works, but the Plugin model often queries with large blocks of text, causing errors. It works again when I ask it to break the query down to as many smaller queries as possible. It would be nice if it automatically did this after a few errors, instead of doing manual calculations with the Plugin model.
Also, raising the 15-dev limit for Plugin testing would be useful for development and testing. In terms of development, more testers would help with gathering feedback and identifying issues. Also, I see so many interesting plugins I want to test but as soon as the Plugin gains traction, the limit is hit.