Update: Would you believe there are <800 Unknowns left from Feb ~23 2019 Penang? It was doable to get that far thanks to this tool! :) (Of course most of them are just labeled “Plantae” now but that’s better than it was.)
Meanwhile, one possible feature request based on this post
https://forum.inaturalist.org/t/amount-of-unknown-records-is-decreasing/8594/336
If the app had a toggle setting for Captive (ideally with default = No), that would cause the records mentioned in that post to be handled easily through this tool.