yes .. 04 europe / middle east region code for the Playstation 3 console

i don't think it makes huge difference .. for Playstation 3 games , you can play any region ( all PS3 games are region free @ no region protection ) .. for blu-ray movies your console would be region B .. for DVD movies region 2

meanwhile most of blu-ray movies in malaysia would be region A ( only some of them are region free ) , for DVD movies region 3

Uh, I use a few different cables (incl China Made ones) and got no issue so far. Of course you can be safe and spend a bit more like RM 10 for supposedly better / branded cable or just suck it up and take the risk (which I think is pretty much non-existent as I usually buy the cheapest one around).
All games have their own server and issues irrespective of account. Your PSN account does not define which server you're playing on (eg Killzone 3 you can choose the servers from which region like NA, Asia, Europe, etc.). By default games will normally route you to the nearest server (if they optimize their code that is) so don't worry bout each account you log in from. Have played using US & UK accounts and no difference to me so far.