Any way to get smaller key sizes?

[Jason Barrett]

Good afternoon,

I am using GPG for encryption of sensitive information in a database.  Some
members of the development team are concerned about the space taken up by
strings encrypted with 1024-bit keys and would like to sacrifice some
security by reducing that key size.  GnuPG will not let me do this with the
--gen-keys command; is there any way I can get around that and create, say,
a 512-bit key?

Thanks,
Jason