Hello Daniel,
I was not sure about this either. So I asked the person who was the lead designer on the project. He said that he agrees that it is probably not needed and probably does nothing when changed. I keep thinking that there must be a reason for its inclusion in the datasheet but I do not know what it might be. This part was designed some 25 years ago so it is difficult to dig up any more data than what I did find out.
I imagine by now you have worked out the issues. Let me know if I can be of any further help.
Thanks, Dave T