So far (On Phoenix) the only time that I've seen specific shouts for JP parties, was during the double Capacity Points Campaign.

One of the major issues with the system is that a lot of the categories are either downright useless, or extremely situational at best. I actually went out to farm JPs on BLU, just because they have a category that's actually worth levelling.

Sure, some categories will be good when they're capped with 30 JPs, but if they continue to scale as they are, that's 465 JPs per category, or 14 million capacity points. 52 million CP to completely cap 1 job, assuming that they don't add more than 4 categories to each job.

Absolutely ridiculous. It's added just so that people have something to aim for instead of leaving to play another game, while they work on real content.

Bear in mind also that it was stated when the new SP abilities were being considered, that they were going to introduce a way (Job Points) to reduce the timer for SP abilities by/to 30 mins. And we haven't seen these categories added yet, so there's more coming.