I´d love to have a "Next Column" trigger in Arena. Just a big button in the middle of the interface, with the word "GO!" on, that triggers the next column. Maybe there´s room for a nice green button to the right of the BPM monitor?
I haven´t found this functionality, but my apologies if it´s there and I have overlooked it.
A "go" button would make setup and programming so much easier, and make life awesome for whoever has to run the cues, if they have to trigger from the keyboard, or from a single MIDI button.
Also - I´m +1 for a MIDI or keyboard timeline scroller functionality.