And after reading the whole rest of all the forums as I always do, I just forgot all about it. Luckily SH4 loads very fast so it's no problem to install the file, load up the game and find out that no, it doesn't work at all. Too bad.
Of course you could have done the same and had an answer within minutes. Even beat me to the punch here and made me look stupid - not that I have any trouble doing that all by myself.