[Dumyat]

2. If you create a user-defined channel and then want to delete it, there should be a way to delete the channel without having to delete all of your user-defined channels. 

Bart,
If you want to delete a channel after you have created it, just open up the settings, then the channel manager, then press enter on the channel number you want to delete. At the bottom, it says clear configurations. Once this is confirmed and you press OK on the main dialog, the channel disappears from the main channel list. 
Hope this helps