|If it's connecting automatically, then why are you bothering to look at the list of available WLAN's?|
I'm sorry but, I don't know of a way to block just some of the WLAN's in the "available WLAN's" listing. There's a reason for the listing which is mostly for mobile users. If you're not mobile, then just simply stop looking at the list. I fail to see why you're having an issue with that.
Oh and just FYI, wireless sucks for gaming. If you're an avid gamer and own a decent gaming rig, compare a wired connection to a wireless on a couple different games you play and you'll see what I mean.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.