I think as long as the damage formulas are fairly accurate, what I need most is actual delays.

These are

1. Animation delays for instantcasts and oGCD abilities. This is vital for obvious reasons, as it impacts dps.
2. Cast delays for spells (travel time). This is necessary mostly for BLM (firestarter procs) and possibly SMN (bio > fester delay).

So far noone seems to have this information.