hash(hash(plain, salt), salt2)
#1
Wow, hashcat is cool. 

Is there a way it can do hash(hash(plain, salt), salt2) instead of hash(plain, salt2) where salt is constant, salt2 is from the password hash, and plain is the plain text.  The hash is pbkdf2-hmac-sha512 mode 12100 fwiw.
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#2
Arbitrarily combining hash modes is not possible. Have a look at mdxfind.
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