A work around is to add a safari extension like "Keyword Search" and associate a key word to your search. Its nothing like setting a default search engine for a normal user, but atleast there is a way for the slightly more technical user.
Though, I couldn't add a keyword to your site in firefox with its "Add a keyword" feature. Might be due to the javascript calling some url behind the screen.
Though, I couldn't add a keyword to your site in firefox with its "Add a keyword" feature. Might be due to the javascript calling some url behind the screen.