Make it deadly Rated 4 out of 5 stars
I think you guys are on right path to make this great plugin.
Consider these things.
1) The moment I select a search engine, I want to see the results immediately on new tab or same tab.
2) Optional but consider this also. The moment I deselect a search engine, I want to close search engine results (OR close the search results tab).
3) Working Ctrl+Shift+k shortcut.
4) Button to clear all search engine selections at once.
5) Last but not least and quite useful. Ability to add new search engines based on search URI for search word 'cool' (Similar to coolpreview search)