A command for changing the current channel would be useful.
For example, in the irssi IRC client, you can enter "/window goto #programming" to change to the #programming channel.
Of course, that's quite cumbersome, so I create command aliases for my favorite channels. For example, I can enter just "/p" to change to the #programming channel because "p" is an alias for "/window goto #programming".
Therefore, I would love to see support for both command aliasing and a command for changing the current channel.
Another useful command along these lines would be a command to switch to the channel I was previously looking at. In irssi this command is "/window last", which I alias to "/l". That way I can enter "/p" to go to the #programming channel, I can say something there, and then I can enter "/l" to return to whatever channel I was looking at before.