Create an implementation of SHA-2 which can be extended to an arbitrary number of rounds. MPFR may be useful to compute round constants.
Also, allow the IV to be tweaked with an arbitrary value or string in the style of the SHA-512/t IV Generation Function.
Can SHA-1 be made secure again with more rounds?
Side channel attacks could get more dangerous.
The general idea is, with both computers getting faster and specific user requirements such as a computational delay in UI only needing to be imperceptible, crypto often does not need to be as fast as a single standardized version which made a time/security tradeoff in the distant past.
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