Mostly good points you raise ATSI - obvious stuff that some don't seem to be able to cope with
Mensa - GMC = Ground Movement Control, and if ATC tell you 220 kts, then that is what you fly 'til they tell you to slow down. Of course, if you feel that the aeroplane is getting away from you (and you don't want to write an ASR) then ask ATC if you can slow down!!
As for the clowns who know there are x number of inbounds and then ask for the opposite end, well, what can I say??