G'Day SandIgger,
The problem is any aircraft that does something other than what they've told us they are doing. That is, if maestro is told that you are doing 300 knots til 10,000ft and you are acually doing 265kts, maestro will sequence you and perhaps more importantly the aircraft behind you based on the 300kt data.
I tend to ask internationals what speed they are doing on the descent, it's not that we don't trust you, it's probably that if you don't operate into a port often you probably descend a little slower??
Not quite sure how many internationals have started the econ descents, but yes it does affect how you sequence. Perhaps that's what happened into CS the other day, perhaps they knew the bloke behind was going to go balls out and the other fella was going to econ descent??
