I must say I am somewhat baffled by reports of problems with rwm generation (inc. adding new buildings) and also (now) the 1.6 camp. map from 1.4

I have had no problems whatsoever.

Perhaps I've just been really lucky though I've likely played around with it more than most so I cannot see how I have avoided any inherent problems.

1.6 makes some changes to the disasters text file, victory conditions and descr_strat (and I believe the "unlocked" file) but that's about it as far as campaign files are concerned.

Can you be more specific?