[speeder]

The game actually does support decent threading, but it relies on old RDTSC behavior and will crash on modern CPUs if you allow all the threading to run. I nagged EA a lot to Open Source SC4 or allow fans to fix bugs on Windows version, but they are stubborn :(

The Mac version is published by Aspyr that has rights to the source and to release updates. For example the Mac version is 64bit now. Windows version is 32bit thus heavily limited regarding mods.

[mhh__]

Similar with the Sims 3, the Mac version is 64 bit the windows version is not and thus becomes unplayable after a given length of savefile.

[scrlk]

I'm hoping someone will consider starting an "OpenSC4" project, in the same tradition as OpenTTD or OpenRCT2.

[speeder]

There is such a project, but sadly I am not involved with it right now because I am spending all my time trying to get a new job.