Adding step / incremental autocomplete option

In some cases we do not want to send a new request after minLength limit is passed, on each character that user enters.

As example, on the http://jqueryui.com/demos/autocomplete/#remote, minLength is set to 2 and when I type more than 2 characters on each new character a new Ajax request is sent. It might be good to enable incremental autocomplete so when we set minLength to 2, new request might be sent only when the user add/delete 2 new characters in the text-box (e.g type 2, then 4, then 6, then delete 2 characters).

Could you add something link a incremental:[true|false] (default false) so we can control whether the Ajax request should be sent after each character or incremental. This incremental parameter might be used in combination with minLength only.