Signature key length limitations

[Aaron Lehmann]

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Hello,

I want to generate a signature key that's longer than 1024 bits.
However, this isn't allowed by the DSA standard, and GPG tells me that
using ElGamal for signature keys is "deperecated". While GPG doesn't
say the same thing about RSA, it seems unusual to be generating RSA
OpenPGP keys in the 21st century.

What's the best way to go about generating a large signature key (and
why doesn't GPG provide a clear way to do so using a discrete-log
problem based algorithm)?

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