Is there a possibility to disable some servers in the list, it's really annoying to wait until all the servers in which I never play have updated.
I tried to delete them in the server file but it didn't work...
btw I use Mac OS 10.5

The server file automatically updates when you run the game, so deleting them would just force the game to redownload the IPs. I believe you could remove servers from the list in earlier versions, but I doubt there's a way of doing so in 3.1.

Note that a means of quickly joining a server is to learn what number it corresponds to on the server list. For example, I know that the Jousting server is server 6, and themy clan server is server 44. From singleplayer I can type

/join 6

And instantly join the Jousting server. In the same way,

/join 44

Would get me to my clan server.