Back to the original idea of this thread, surely you are a controller, so control. If you need a different speed, then do it. Everyone doing whatever they like is all very well if there's nobody else around, but if there is then do something about it don't just whinge at the guys following their company sops.
Personally I'd like to ban anyone who can't do 400kts+ ground speed or can't climb at more than 1500fpm, but it aint ging to happen so I work around it.