In regards to Tenacity(and Piety in case healer mains see this) just make it also increase Direct Hit Rate stat so I can save my Direct Hit Rate materia for DPS jobs... it's not rocket science...

As for Skill/spell speed... I agree with merging the 2 stats into 1, but let's focus on making them better first... like having them affect cast and recast timers for abilities and auto attack delay... that would be a good start...