Hi-res to Low res ratio: be reasonable, if you are pushing it too far you will get cracks along seams as well as a general stretching around the UV border areas. This also highly depends on the angles you are displacing, like if its a simple shape, you might be able to get away with more extreme displacement, but if you are displacing something complex like a character, in my tests I found a good ratio to be a 8000poly lowres to a 2 mil hi res. Again this really depends on the type of character you are doing, but this is something important to keep in mind, always do tests before you start rigging, and if you followed all the other rules, and still get seams, then you might want to render from a higher level that you were originally planning for.
MD3 settings from top down: 0,1001,4096(or what you want), 100, 0, 8. These are actually the defaults. The most important from these settings is the Border and the Texture size. I did a lot of tests with this as well, and Border 8 is the best value, anything less may result in visible seams, anything more may be too much. As for the texture size its always 'the bigger the better' you will get more accurate more artifact free as you use larger and larger maps.
Quick Code: DE-LBEK-EAEAEA-D32, This is still the best quick code for renderman, I did some tests with A.D factor set to Off or Auto, but this resulted in a lower quality displacement. Seamless didnt seem to do much, Smooth just generally blurred the whole map, leave these settings off.
Merge UVs in Maya, Zbrush3.1 unfortunaly has a bug and will export your UV's all broken up into individual UV islands for each polygon. So when importing back to Maya, open up the UV texture Editor, and select all, and select Polygons/Merge UVs with a very low Distance Tolerance. See 4) why this may be neccesary.
PS: I seen people changing the Color Balance in Maya from 2.2/-1.1 to 1/-0.5 for ZB3.1, but for Renderman I still got best results with the original settings.
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