CoolMoo5
I Love YTtalk
Somehow it is possible to get another channel. You probably have to have connections though. Freedom is a youtube multichannel network and they own channels like sport (youtube.com/sport) and gamers (youtube.com/gamers). This is not a vanity url and there is no way those urls were available. Also, Shane Dawson got the youtube.com/shane channel. And even Fred back in the day got the youtube.com/fred channel from another user. So I guess it doesn't hurt to have connections. Obviously if this feature can't be available to everyone and small YouTuber like me couldn't get another channel, but maybe you know somebody or someway to make it happen.