Essentially there are some administrative tasks that temporarily require root access and logging in as root is not recommended from a security point of view, hence granting sudo access to specific users.
An easy to find HowTo for this would definitely be a real good starting point for this and it would be interesting to hear from the community as well how many feel the need or want to grant a specific user or users sudo access.
Although having a checkbox option to select on the user account information page would be nice for ease of use, I am unsure if that is a good idea or not, depending on how it gets used and if it opens the possibility of it being abused due to lack of understanding of the functionality or potentially political abuse of a boss who doesn't have the required information demanding the privilege and then doing some damage (although I see this an a rare situation and rare occurance).
It would really depend on the business case for it and how many people think its something that would be of benefit. I know that I think it would be good to have, but then I'm biased based on the work I do.