[Kalcor]

The SA data files are somewhat protected from modification in SA-MP and there is no easy way to change this without hacking the client.

We did produce a special version called 'gtau-mp', which was essentially a modding version of SA-MP. gtau-mp allowed you to modify the GTA data files freely. gtau-mp was only a beta test though, and we found it was fun but not really that popular. I decided to put gtau-mp on the backburner until GTA United 1.2 was released. I read somewhere that GTA United 1.2 was going to include all 3 GTA III cities in 1 map (LC/VC/SA). I think they might have given up on this for technical reasons though.

I know there are some unofficial SA-MP client hacks to allow modding, like that gtasrv.ru. For now I said they can host these mods until SA-MP comes out with an official modding version. I'm not sure when we'll produce this though. A lot of people are still content playing San Andreas the way it is, without any custom artwork or data files. There is also a belief by some people in the SA-MP beta team that having 2 seperate SA-MP mods with different server lists would divide the community.

So, there are options available right now but none are officially supported.