How to handle a problem client... - Tara

Okay, so I have a client who is driving me nuts.  I wonder what the general consensus is about how to handle a really pesky issue I'm having with him.  This particular doctor is an older gentleman who wants to do things to look like he's keeping up with the times but doesn't want to change how he does things.  He's also cheap as sin and thinks that because he's a doctor and I'm an MT he's above me in life.  Not kidding.

Anyway, the issue I'm having is where to draw the line on the "customer is always right" sort of mindset.  This man is always griping about something, no matter how big or small.  I finally drew the line in the sand with him when he started using abbreviations that are considered dangerous in the field.  I type them out.  I told him when he first hired me and I set up his entire transcription end of his practice that I would not use the abbreviations on that list, gave him several copies of the list, and also explained the reasons why those abbrevaitions are dangerous in today's medical record mindset.  He wants to use them anyway now, and I know it's because he's trying to cut corners on his transcription fees. He uses a lot of strange abbreviations (for instance he wants MO instead of "mother" in general English and things like that) and I don't do much because they're not on "The List."  

How would you handle this?  Give in to yet another demand when you know it's wrong, or just let the customer have his way, or let him have his way but have him sign a waiver that if something is misinterpreted it is on his hands and that he understands that I am typing the abbreviations at his request only...  I'm just not sure what to do in this case.