Hi all, 
Firstly; apologies for what is probably a newb question and possibly in the wrong place. 
Here goes: 
Whenever I'm standing on top of a scyscraper I get an uncontrollable urge to snipe at cars & stuff but of course they're not there.  Can you increase the "spawn distance" of cars / peds and if so, where would be a good place for me to start looking / modding? 
Any help gratefully received. 
PLEASE!