No, it's not. It only makes the rotation more annoying
GCD usage without the passive: VB - MB - MF - VB - MF - (MF contines to channel) - VB
GCD usage with the passive: VB - MB - MF - VB (MF continues to channel) - VB - MF - MF (you have to press MF here again after a single GCD) - VB (MF continues to channel)
There is nothing good about allowing VB to be used during a MF channel.