Such a thing would be useful for reporting chronic shitposters/spammers instead of the now-tedious method of reporting each piece of shit post one-by-one. ~snip~ A simple "report profile" would be nice, and then a mod could do a quick check of a member's post history. Usually you can just look at the first page and conclude whether someone is a bounty spammer or not.
Personally I don't see the need for a new button, simply using the button that we have and stating in the report that the issue with the account can accomplish the same thing. I'd be far more interested in the indicators of reported posts and "inactive account"(for banned users). Saves time for reporters which would be nice.
The thing is to use that button as described the onus would still be on the reporter to make sure the profile is in need of moderation as opposed to an individual post. I get it it's time consuming and annoying to have to justify reporting a profile, but without due diligence this could lead to bad reports and create a larger backlog for moderators. On that note more moderators sharing in the workload - maybe even some "trainee" Mods just to help out, we could consider them "unpatched" Mods until sufficient time has passed in the eyes of theymos.