I like using the search operators to easily find a message. I would be interested to search messages which are pinned or tagged with a simple parameter, like pinned:yes . I know I can click on the Pin button to find all pinned messages, but then I can't seach for a specific text within the pinned message.

To give an example, I'd like to search all pinned messages mentioning the user tom and the word "server". I would like to type:
@tom server pinned:yes