Give the option for no rest time after the last set of an exercise.
If I give a client bench press for 3 sets and I want them resting 90 seconds between each set then I would select this on the rest time tab, however, that 90 second rest also applies after the 3rd set. What if I want them resting 3 minutes before their next exercise instead of 90 seconds? I have to select rest from the menu and select 3 minutes, but that pesky "90 second rest" is still there after their 3rd set of bench. It is a confusing feature.