I know nothing about SOCKS, but, since no one seems to want to answer this, I'll give it a shot.

Can you get Net::SOCKS to run. You should be able to modify the code below to do a get from the SOCKS proxy. If you can get this to work, I don't think that it will be hard to make LWP work with it.

use Net::SOCKS;

my $sock = new Net::SOCKS(socks_addr => '192.168.1.3',
            socks_port => 1080,
            user_id => 'the_user',
            user_password => 'the_password',
            force_nonanonymous => 1,
            protocol_version => 5); 

# connect to http port and request /index.html
my $f= $sock->connect(peer_addr => '192.168.1.3', peer_port => 80);
print $f "GET /index.html\n";    # example writing to socket
while (<$f>) { print }     # example reading from socket
$sock->close();
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