Not letting us be able to modify this really, really, really old and UNSUPPORTED hardware by holding back information says more about the people that have these rights then they are aware.
You should go to Phase5 and have a moan at them.

No, if someone wanted to spend the time and trace back the extra address signals to see which CPLD they went to and look at what signals the chipgets by changing the jumpers the code required should be easy to write, the Fastlane only uses small CPLD's.
The fact is there are almost no businesses left to do the work and hobbiests pick "interesting" projects.
That was my ego ranting part.
Yeah, Im in a ranting mood too :-D