Dear Mr Dowson,
Sorry to come back to you on this as my original question was clearly an irritation to you. I think I now understand the way this is set up and my previous confusion was due to my having conflated the instructions in the Advanced User Guide with some discussion about settings on the forum. I am now using version 3.999s as required and the entries in my INI file read ZapAirRange=1.50, ZapGroundRange=0.25, ZapCylinderAltDiff=500.
I remain puzzled though as to whether it is possible to increase the Air Range to make a larger cylinder. I see that in a recent answer to a related forum question you said "The assigned traffic zapper controls take no parameters so any provided will be ignored".
However the wording in the User Guide seems to imply that it that it may be possible to adjust the range (at least in my reading of it). When describing ZapAirRange and ZapGroundRange the Guide states "These control the range of operation...." and a bit later with regard to the acceptance angle the Guide says "It is adjusted automatically, in linear inverse proportion to the change in the range so with a larger range you would need to point the aircraft nose etc......."
Certainly I have not succeeded in enlarging the range by adjusting the ZapAirRange setting but if it could be done I'd be pleased to know how. My problem is that I find again and again that an AI conflict will position itself around two miles behind me on the glideslope, just too far behind to be out of zapping range but close enough still to be forced to go around after I land. A cylinder with a range of 2.5 to 3 miles would resolve this. With apologies in advance if you find the question tedious or if I have misunderstood something but I hope you will recognise that wording in the Guide may be slightly ambiguous on the matter.
Thanks,
Gary