decrease spell casting time for the new spell Crusade

[Martel]

The only reason I was able to maintain some semblance of hate control was because I was /drk and using last resort to lower my attack delay as much as possible.

From the April-30-2013-(JST)-Version-Update notes
"The job trait Desperate Blows may now be learned at level fifteen*.
Desperate Blows reduces delay for two-handed weapons when using Last Resort."

Meaning, unless you were using a great sword, you weren't getting any delay reduction via last resort.

I'm wondering if Suppa lowers attack delay even if you only have one wpn equipped? If dual wielding gets applied even if only one wpn is equip the devs could add more gear to help pld lower its attack delay so that in situation were hate is capped we can maintain hate.

It doesn't. You must have a weapon equipped in both the main and sub slot for dual wield to have any effect.

This becomes extremely clear when you single wield /nin, and still have your original tp per hit.