I see, hum… I think the discussion deviated from where I wanted it to go 
I guess it boils down to the following,
- It might be possible to make a citation key generator that generates the exact same key as Papers 2/3, but I can’t. I would need more information for that. If Readcube Papers does not currently support the feature, I assume they can’t help out.
- Making an “universal” citation key generator similar to the linked one is possible, e.g., a
[Mekentosj]“special field” based on the link with some changes. - Making a “checksum” modifier (e.g.,
[title:checksum:truncate2]), in which case the user could decide themselves what probability of collision they care about, could be an interesting addition to the current “Letters after duplicate generated keys” scheme. Are you interest in implementing this?