IMO the devs should create an 8v8 mode. It doesn't have to be Feast, it can be another PvP mode specifically designed as a 'fun mode'.

In other words, it should be casual and stressfree.

I also think an 8v8 'capture the flag' game would be a fun addition to PvP.

... an 8v8 capture the flag game where the rewards for participation are... humorous. Like a giant Spriggan or Moogle costume, or glowing weapons that make funny (and annoying) noises. hahaha

Just throwing some ideas out there. ^_^