"Salt" does nothing to address the primary way passwords have been cracked for the past 20 years, which is with incremental password crackers like Crack, L0phtcrack, and John the Ripper. Your comment about "anything not being used by the NSA" is silly, and misses the point entirely. Most Rails app users will entrust those apps with horribly bad passwords; bcrypt protects those passwords, and "salted SHA256" doesn't.

If you don't understand the problem you're trying to solve with this plugin, why are you promoting it?