MIDI auto detect always turned on

If you connect a control to a MIDI controller and then select "edit connection" again, automatic detection is turned on. The problems with this approach:

• A stray CC could change the connection to another device, channel and CC.
• Just opening the dialog will enable the selected channel/CC combo on all devices.
• There's no way to see which device the control is listening to.

My suggestion is to have automatic detection turned on only if the control isn't already connected.