Wow, you people seem to have problems that I never imagined possible.
The original statement was "it's impossible to write an engine that emulates the DarkEngine with 100% accuracy". This is actually a void statement as any software that behaves exactly like the DarkEngine is just a copy of the DarkEngine (whatever the definition of the DarkEngine may be).
The correct reply to this is: nobody gives a shit (it is even undesirable to have a perfect emulation as this would rule out running in 32 bit mode or high resolutions). Many emulators of machines like the C64, Amiga and other old machines have proven that a group of dedicated volunteers can do amazing things.
If an engine can be written that runs the official campaings while not emulating some of the weird bugs (rope rocketing, SHAS, door/ai/...-jumping, elevatoring), many people will be happy, as some future version of windoze will undoubtedly stop to run the T1 and T2 games (it's already difficult to make them run on XP). If that engine eventually even emulates these bugs I and maybe a couple of other freaks would be delighted. If that engine can run the thief games on Unix, I'll mark the day in my calendar as this means that windoze will be deleted from my hard disk forever
Of course suggesting people who would make such an effort are just idiots who can not see the one true light is counter-productive.