Included additional form fields when adding/editing a channel

Hi @rcrichton. When you have a chance can you just review the additional form fields i added for the channels form. I am encountering one issue i need you help with. How should the "Properties" be captured? I see in the schema it is objects within an array. Currently if i supply a value for this the save does not work as its not supplied in the correct format.
Maybe change the placeholder text to read: "Enter the user groups that can view transaction created by this channel...". And the same for the rerun one below.