The problem with such a behaviour is that the wm would need info on the optimal geometry of an application window. The ICCCM defines the WM_SIZE_HINTS for that but not all applications make use of this feature (very few actually). So, no, there is no straight-forward way to implement the MACish maximize function with fvwm or any X window manager for that matter.
Maybe you can write a funtion to read out the WM_SIZE_HINTS and set the geometry accordingly but I wouldn't know how to do this from the top of my head.
Resources:
ICCCM, EWMH


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