I know this is something that has bugged a lot of us for a long time so I've added custom BBCode for 'centre/center alignment'. The code is as follows and will centre your text, including images in signatures and urls and anything else you want centred:
[code:3m6i42aw][center]This text is centred[/center]
[center:3m6i42aw]This text is centred[/center:3m6i42aw]
I've gone with the American spelling ("center") because, well, there's more Americans here than any other country (though the Irish are certainly giving the Yanks a run for their money
Anyway, enjoy! I'm expecting a flurry of signature related changes in the near future
Edit: I've put it on the post screen, sitting to the right of "Font color", for easy access.
Edit 2: I've taken it off the post screen, for reasons stated below!
Alas I wouldn't be so bold as to alter anything drastic. But little tweaks like this, sure. If you have any ideas that don't involve much (and have no chance to cause problems), then by all means, out with them!
I think there was once an issue with the signature character limit, which we wanted raised. But IIRC that was only because we had to go to extensive measures to centre our signatures. So now that we can do it with a bit of BB code, I don't think we'll be going anywhere near that limit again.
I need to sort the links in my signature out now that there are three MW3 threads... Dick.
Actually that one MW3 Thread link I have brings you to the general one, and within that there are links to the MP and SP threads right at the top, so I should be alright.