How about an opinion:

[jicecone]

I don't think it necessary. If you have a good training program that throughly covers what it takes to be a good official, an evaluation system that reinforces that training and advancement, that rewards those that work hard at executing what they have been taught.

Some of the best input we used to have was attending league meetings and hearing that your guys are doing a good job. Believe me if they aren't, your going to get an unsolicited evaulation the next morning.

Evaulations should only be used as tools in your umpire development program.

How do you deal with the veteran that won't stay up with the rules, refuses to adhere to association mechanics, won't attend training and is still overly arrogant on the field?

Limit his assignments, bring him before the board, put him on notice and don't be afraid to expel if necessary to get the message out to the members as to what is expected.

Got a little wordy here but, I just don't think the coaches input is necessary if a good program of training, reinforcement and reward is properly implemented.

Been there , done that.