Ok I see your point G-MANN.
All I can say is that the system is designed so that the RFI is already in and there should be no need to file an RFI when you have a slot. If something better comes along for you then it will be allocated automatically.
Maybe someone from the great institution itself can confirm??
With regards to making the call to the CFMU I agree sometimes its what you need to do. A computer can never give you the same interaction and use a bit of common sense as a humman being can.
For example if you have a two hour delay that will impact into closing hours of an airfield, a quick call to the BRU boys and girls can make them understand that it would be better if you took priority over somone operating to an H24 airfield. At their discretion of course.