To clarify a little bit, macro as much Enmity as you can into actually using Sentinel (No Enmity during it's duration, but as much macroed into actually using the JA helps increase the Enmity gained from using it).
Beyond that, macro as much Enmity as you can into Rampart. (Or have 2 Rampart setups, one with max Enmity you have for hate purposes and one with max VIT you have for survival purposes).
Macro as much Enmity as you can into Shield Bash (Or if you're anal like me, I macro in Shield Bash + gear, then Enmity)
Macro as much Enmity into Cures as you can, and always cure in a Hospitaler Earring. A full Cure 3 or 4 with a Hospitalers generates more Enmity than the same thing with a Hades+1 in place of a Hospitalers.
Macro as much Enmity as you can into Atonement (Assuming you have it, if not just work on obtaining it as you can, it's a great WS to have available)
Like it was said before, you're generally better off macroing Haste and Fast Cast into Flash, then Enmity everywhere else. Exceptions apply when you have Haste and 2 March and a ton of Haste gear, but Fisbans calculator can answer those questions.
I have 2 Flash macros, one when I'm receiving less than Haste and 2 March and one when I'm getting all 3 things. My first setup has 19 Haste and 2 levels of Fast Cast, and 25 Enmity (Including merits, not including Dorado Sushi or a Main weapon slot). My second only has 14 Haste and one level of Fast Cast, but 37 Enmity (Again, not accounting for Food or a Main weapon).
The first setup is actually better unless you can still cap your recasts with the second setup. More Enmity with a higher recast is worse than less Enmity with a lower recast, for any fight lasting long enough to warrant a dedicated PLD tank.
One trick that I do that helps, is macro all my Haste and Fast Cast gear into Reprisal. Cutting that recast down helps you keep Reprisal up more often, resulting in a higher Shield Block rate for more of the fight, for minimal effort to write a quick macro to do this.
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