Hi!
Ok let me try my best to answer your questions. I know that some games support local multiplayer, but you will have to read up for the specific game if the local multiplayer option is supported. For older games (like digital classics), I am not too sure.
The South African eShop is not really up to standard at the moment...I have been in touch with the Core Group (they represent Nintendo in South Africa) and I have asked a few questions, I am awaiting a response soon. I will post their reply in here when I get it.
Many people (including myself) advise new users to change their region settings to UK, as there is more content. Buying points is still an issue though. I am working on a solution to this and will see what the easiest way is to do this.
EDIT: I will post any feedback in the 3DS thread, just to keep stuff central. Linkie:
http://mygaming.co.za/forum/showthre...3-Nintendo-3DS