I don't really think so...
If you look here...
http://rcdb.com/3570.htm?p=19568
You can see how it is a round restraint that is elbowed at the side of the seat. On other rides they are T bars or U bars that reach down the sides...and the bars have space cut away...where as the ones on Mav are round and put more pressure on the thighs.
I think this is by accident and there is no real reason they are different....just the way they are made....but it would be nice if the OTSR's had room for legs to fit...but it would be hard with people having diff legs sizes...but it could work.