ok what you need to do is open say the abc mod folder then cut and paste the gamedata folder within it, into the stalker main directory then it will work ok
You dont place mod files in the bin folder. Its just like fishy said, just copy and paste the gamedata folder from the mod, or you could create it then put the mod files in the gamedata. If u do that the mod should work fine.
yep. you can put as many mods as you want in the gamedata folder. but make sure that the modifications dont conflict with each other. Otherwise you might have BIG problems.