Mayhaps the transparency problems only surface at specific hardware/driver combination or something
I considered the same thing while I was writing my previous response but discarded the idea since it really wouldn't matter for the reference shaders one way or the other. The 1112 and 1119 shader sets are part of the same "family" of sorts, the shader rewrite that was in part specifically done to fix the transparency problems. The difference could be hardware/driver related, but I really doubt it. Most likely is is simply due to the difference in test data, where what you have works but if I was to go through my test suite again it would still have the problem.
But I'll have a look at the spec map issue next week and see if I can't work out a shader fix that solves it.
Also, if the shaders are to be considered media rather than parts of engine, should this conversation be in SCP forum in the first place?
Going strictly by the original topic, no. But technically it's a 50-50 thing, where it is part data and part code/engine. I'd say it's just as valid to have this discussion here as it would be in the modding or upgrade forums.