Doosan Puma 240 & 300 funac I series

Machines brand new October 2013. Is there a parameter or setting that can be changed so that when the machine rapids both the X and Z axis arrive at their final destination at the same time? Straight line rapid moves! Is there some reason I am not aware of this should not be done? It scares me to death sometimes when I am not expecting it. Anybody?
-Brent-