Somehow telling the boss to "prove" the benefit may not be the best thing to do if this guy wants to keep his job. The boss says do it. I don't think it's going to make any difference in the machining. Most likely he's concerned about smaller programs that are easier to edit at the machine.
To Change it... Go To....
Settings - Control Def.
Select "Arc" from the left side.
In the dialog on the right, under "Arc Breaks - XY Plane" check....
Allow 360 degree arcs and set Arc Break Point to "Dont Break Arcs".
I wouldn't bother to change it for YZ and ZX arcs. It's probably pretty rare that you ever do them.
That should fix you up.
Mike Mattera
Tips For Manufacturing Training CD's, DVD's for Mastercam, SolidWorks, Inventor, G-Code Training & More
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