Disallow searching in specific forums

I have a couple forums that I would like to turn off the search feature for (like an Off-Topic forum). It would be nice to save the load on the server for more important searches.

I think it would be best if it was an option that could be set for the forum under the permissions section where it has "Show Forum / Read Topics / Reply Topics / Start Topics / Upload". That way you could still allow admins/moderators to use it in that forum.