@Deborah - What you asked on Twitter is what options there were on reCAPTCHA *AND* if tabindex could be disabled. We said the only options on the field is which skin/color you want to use and that tabindex CAN be disabled but not in the admin. So you must be confusing the answers to your two questions.

Either way we never said reCAPTCHA was required. NO field is required on a form. A form is made up of whatever fields you decide to add, that includes captcha. If you don't want captcha on a form, you don't add it to the form. Your form only consists of the fields you add.

What you were told could not