Is there a way to crack these kind of passwords or does it require a feature request?
Also, what is the syntax of input while if these two salts are different. Basically this is about postgresql authentication protocol which uses hashes of format
MD5(MD5(password || user) || per-connection salt)
yeah, due to the per-connection salt speciality it requires a new hash-mode and therefore you need to create a feature request on hashcat's trac