Goad is a piece of raid utility, and one that I find is rarely used as it is.
A good NIN will goad a MNK or BRD in their party before they even use their first invig then goad the MT as soon as it comes off cd.
A bad NIN wont use goad unless someone asks for TP.
A terrible NIN wont use goad at all even if someone asks for it.

Unfortunately in any DF group the first of the three examples is beyond rare and if NINs were able to goad themselves the latter two would only use it on themselves.
I think what would work best is making goad more appealing to use beyond helping the team. For example a trait that causes the NIN to gain the effect of goad at 50% effectiveness when used on a party member (Call it Goading as they are goading an ally on or something) and as the NIN will get this every time they use goad (where as you will be using goad on different party members each time) it will be as if they could goad themselves.