I don't know if your TV supports discrete inputs, but there appears to be an "input toggle" button with code 184, you can probably use this in conjunction with the channel up button in a macro.
If the CH+ button always throws you back to live tv, you could follow this with two presses of the input button to get to video2, that's what I do with my Toshiba TV that also lacks input selects.
Rob.
http://www.hifi-remote.com