A simple addition that I'm sure everyone will find very helpful is a timer. One that shows the duration of the time you've been playing for in your over all set. One that works like a stopwatch with start, stop, pause and maybe even lap . This will help with making mixtapes, dj battles, billing clients appropriately, keeping on schedule for performances and much more. I know one can always look at their clock and keep track themselves but it's easy to forget. I wouldn't have to be very big and it could fit in several different locations.

Thanks for considering it.