Instant Search box feature
Not sure if this had been brought up, I did a search for it and none found.
Basically this would be similar to how the latest Google Search box instantly displays the results, only in CP's case, it would display existing ads or Ad-Tags as a drop-down list on the go.
Pros: Would allow the user a faster search results based on the first couple of characters they enter, if the ad exists, then its right at their finger tip, if not, then the search box field will halt at the last character that doesn't match any existing results.
Cons: Not sure if this will slow down the server given it's an instant search being deployed hence fetching input from the DB on the fly, a workaround would be to entice the user to choose a Global category first then type in the search keywords, allowing a less heavy load on the DB fetch.