Okay, well that clears things up. This isn't a "biblical scholar" so much as one who is educated in Bible studying.
When we use the term scholar it brings in a whole host of other concepts.
As for what you've mentioned, if you don't know the languages it'd be hard to use any of the tools you've listed. You need to know the difference between an pluperfect and an imperfect tense. You need to now the difference between dependent and independent clauses. You need to know the difference between the Pual and the Hiphil.
People who just take up these commentaries and tools without that knowledge are kind of like a pediatrician doing neurosurgery. Sure they'll get some things right, maybe even come to proper conclusions...but its a discipline far beyond their reach and sooner or later they're gonna mess up.
I don't know how much fluency is necessary but you need to have an advanced knowledge of the languages to function completely.
If you're going to be a Bible scholar (again in the academic sense) you definitely need to know Greek, Hebrew, Aramaic, German, Latin, French, and maybe some semitic languages to be totally accomplished. You can get away with less...but I wouldn't want to try it.
As an observation, most of the discussions concerning those matters on the BB is highly uniformed and lacks theological insight and nuance. That's reason number two why I stay away from all their discussions.
Well the experts are men and women who put pants on one leg at a time (unless its a female Bible scholar in the IBF and that doesn't apply) and eat breakfast you buy on the same aisle of the grocery store. We should all persevere to work out our salvation with fear and trembling.