It seems kind of awkward having to retype your name for a commitment if you have it set up on your profile. It'd be nice if it automatically pulled your "Real Name" from your profile and gave you the option to edit it before hitting the commit button.
I think forcing you to type it out is the point -- akin to a signature:
When a proposal enters the "Commitment" phase, we will present a petition for the site's creation. Interested users are asked to digitally "sign" the proposal with their full name to help assure that site will have an active community in those critical early days. While your full name is never shown, you may add an optional comment which is displayed alongside your username in the list of committers.
Since it's never shown anywhere, making you type it is literally the only purpose - remove that, and you might as well remove it entirely.