Simplifying the software stack - any reason CGI can't be implemented into nginx?

[mike]

Perhaps the way standard CGI programs run (compiled CGI, especially
Perl, etc.) is not compatible with how nginx does it's request
processing, but couldn't someone get a CGI module created for nginx so
things like Apache don't have to be used for Perl (or other CGI-based)
apps?

I would love to get Apache out of the mix.

Or, some sort of php-fpm type FastCGI daemon thing that will handle
CGI requests without requiring modification of the code? (I know there
is some FCGI.pm thing, but that requires modifications to the code,
right? I'd want it to be seamless)