I'd be really interested in measuring guards kicks and counters on top of critical hits, critical taken, etc. For guard and kicks the client knows about it since it is animated etc but doesn't show on log, don't know if it would be possible to get it.
Along the lines of the mages request, it might be too much work but you could calculate the overlap of job abilities over the data, like berserk, focus, counterstance, etc. Then you could flag the data (e.g., every hit, dmg taken, miss, etc) with any of those flags, so you could then filter it if you wanted to ask things like "what was the acc rate of all hits when focus was off, vs when it was on", etc.
Also I am sure for crafters having logs of results recorded under time day and moon phase (maybe even direction but probably not so important since you'd already pick the ideal one) would be interesting too.
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