Well, in all my years reading PPRUNE, I've not read a more pathetic entry than that filed by Overload.. What a precious thing he/she is, a super duper air traffic controller, migh what a clever thing you are.. How can you seriously say that 1 (that's ONE) aeroplane can cause that much of a problem? What's wrong with FL260 w/bound "against the e'bound flow"..? Something wrong with the North side of UG1? And as for the problems anticipating the rate of climb.. Is it really that difficult getting the odd a/c out of the way? Marvellous things headings, you should try using them... And so what if the a/c descends at high speed? What's the problem? If it's catching up another a/c you can use vectors.. (remember them?)
Honestly, if you can't cope with ONE a/c, you really are in the wrong job. Perhaps you should offer your services to the canteen, assuming, of course, that you feel you can cope with the breakfast rush..