Please add VCA-style groups to System5 and Fusion consoles. Group masters are great, but any channel can only be assigned to one master.
VCA's (like in PT) allow faders to be assigned to more than one group. This is extremely helpful for bigger mix sessions and better overview.
It is enough if the faders are linked in this case. Linked controls of eq, panning and so on like with group masters is not necessary. But the ability to even assign groups to VCAs would be of much help.