So...I use tweetdeck for twitter, so obviously, I love the way that CS uses the same layout. However...I can't seem to figure out how to add additional panels beyond the default firehose, friends, and notifications and keep them pinned there. Everything else opens in the 4th panel next to them and doesn't stick. Is the customization Pro only?

Watching the dumpsterfire that is Twitter while wondering where I'll ultimately land with my social circle.