There aren't any settings that you can adjust that are going to make a client say "WOW, I am so glad you used those settings that makes all the difference in the world". However, if the camera fails even once I gaurantee the client will say "WOW, I can't believe you messed up the firmware on your camera when you knew how important this shoot is to me".
It is the same reason why Panasonic doesn't use a really high bit rate out of the box. They can't gaurantee that it will work 100% of the time.
It is the same reason why Panasonic doesn't use a really high bit rate out of the box. They can't gaurantee that it will work 100% of the time.