been doing a bit of thinking..again:
PUG and its associated job should get a LB/OB like Mad Rush/Lunatic High where you go berserk and hastened.

GLA and its job Omnislash/Cross-slash/Meterorain

THM and its job should get something similar to Vivi's Trance mode in FFIX or a FFVII Vincent tranformation mode

CON and its job get summon if/when summoning is implemented or something similar to Vivi's Trance mode in FFIX

LNC and its job get Boost Jump/Spear

dunno about MRD and its job though