The F command in a G0 or G1 move sets the "feedrate" or mm/sec for all 4 axes.
Once you set the feedrate it should stay that value for all future moves.
It's best to control the max speed seperately with the marlin firmware. You can set the max velocity for Z and E independent of X,Y. So if you ask for a feedrate of 300mm/sec and leave it there, and then move Z axis or move E axis, Marlin will only move at the max velocity for that axis and not 300mm/sec. If you move 3 axes at the same time, the speed will be determined by the distance and max speed for each axis.
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Daid 304
No bug. The Z speed setting got removed. Z is now down at travel speed, with the assumption that your firmware limits it to sane values for your machine.
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