Cicero lets you add custom search engines directly to Safari for the iPhone and iPad.
● Switch search engines by tapping on the current engine's icon.
● Grab search engines from OpenSearch-compatible websites.
● View search suggestions as you type (available with some engines).
● Incorporate even more search engines from MyCroft's search engine index (look for ).
● Delete a search engine you no longer want with a horizontal swipe.
You can download Cicero for $2.49 from the Big Boss Cydia repository.