Grib configuration

Is it possible, to configure the 3 grib-slots differently?  I want to have windmap as Background and wind/temperature as main/second arrow in slot 1 and rain as background and windwaves/swellwaves as main/second arrow in slot 2 for example. But if I try to configure slot2, the changes will automatically appear in slot1 as well. Is that a bug or a feature? And if this is intentionally, what is the reason for having 3 slots (beside comparing data from different sources?) 
Best regards and thanks for your ansewers
Thomas

It is not currently possible but we are thinking of something around that idea. Might be linked to grib download profiles.

Ah, OK, thank you very much for that really quick answer. I was confused, because at the top of the grip-configuration page you can choose between viewing grip1-3 and all. I did not understand, why you can choose a certain grip-view, but if you make changes, it always affects all of them...
Sorry for that misunderstanding,