Just an idea here for an addon, what about a simple countdown clock for your screen? Since you can set up a rotation on your slaves but its hard to track casting times and cooldowns, why not have say 10 programmable countdowns to help time keypresses? For instance if your slave is casting a spell with a 3sec cast time have a countdown on your master for 3sec so you know when to cast the next spell in rotation. Also it seems cleaner on your screen to have a basic 00:00:00 clock than a bunch of cooldown bars. I'd write it myself if I knew how.