ok first, which part of the AI controls where peds are.
ok now second, could you create a default part of that AI for peds to show up constantly in the same place, eg. when you move to the res light district, it loads up that section of the AI which controls the hookers which hang there.
ok this is realy hard to explain.
Ok could you not create the section of the engine which controls where the peds are and when they are. Set a defualt, so that there is no change in peds eg.on minute at red light then you go to triad area, come back and the peds are doing exactly what they did before all over again, kind of like a broken record. it should be a small file, and it means that everyone can play with peds and cops included, but people will begin to know where the cops are etc. you could release alot of em.
anyway not sure if it would work but if it does, it will be and easy solution, and effective