He may be a touch stern, but look at his results. Plus, Riker was being uncharacteristically stubborn about a moderate, not to mention more efficient, change in scheduling.
If riker said it is going to pose significant problems, it could hardly be more efficient. These two are mutually exclusive.
I am glad you didn't beat around the bush and straight up chose the most stupid of jellico's demands :D
Switching from 3 to 4 shifts with the same people is absolute nonsense. Like you had say 3x100 people before, so now you will have 4x75? These 25 people on each shift did nothing before?
Apart from that, significantly changing teams where people are used to each other and know what to expect from each other and abruptly ruin their sleep patterns before your critical moment is the exact opposite of what you want to do for smooth and efficient operation.
Just because that setup worked for jellico in different circumstances on different ship doesn't mean it is going to work here and now. And I know that because person who, unlike jellico, knows the ship and people, said so.