For me, timing my auto attack has netted a decent amount of dps. I used to be from the school of spam to my hearts content and sit there and do nothing for 10 - 15 seconds.
If most of your combat arts have the same casting time and recovery time *(before modifiers)
Autoattack timer - EQ2Interface
Install this mod into your UI. Cast the number of combat arts it tells you to and pause a moment for an auto attack. Once it is updated from the developer (I'm waiting on this myself) to update per combat art cast, it will be worth even more.
The other way, is to turn off combat spam for everyone in raid except your spells and heals, then watch for a bunch of numbers to appear all at once (auto attack usually procs a bunch of procs and causes a cluster of numbers to appear above the mobs head) and then spam 2 - 3 combat arts and then wait for the next spam.
In all honesty, using both methods would be the best to maximize your auto attack potential. (The plug in doesn't update fast enough and I've been relying on watching the numbers above the mobs head).
One other method you can do is to set act to beep on every auto attack. i find this annoying as hell after the first raid... So it has limited uses.