You don't need to hack LWP at all: the information is available to you via the header() method on the response object.
my $ua = LWP::UserAgent->new;
my $res = $ua->get('http://www.booble.com/');
However, I don't see the availability of the client-peer header documented in the HTTP::Response or HTTP::Headers POD pages, so this may not work in previous or future LWP releases.
(Works for me with LWP::UserAgent 2.033, HTTP::Message 1.56 and HTTP::Headers 1.62.)
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