I always get a laugh when "professional" coaches take cheap shots at the fans, and those "professionals" think that fans could never be proficient at what they do.
Sure, just like ANYTHING, 100% of the general public could not do EVERY job out there well (I'm talking ALL jobs, not just NFL gigs or other sports). BUT, what coaches do is NOT rocket science or brain surgery and I could think of MANY, MANY careers which require more intelligence, creativity, and versatility than NFL (or other major sports) coaches. Look at some of the NBA and/or NHL dynasties...you think they were that great because of coaching? Get real.
IF an NFL head coach can't handle the responsibilities of properly managing the clock, then they should hire an assistant to do nothing but that task. I mean, Christ, how many different assistants do they already employ!?