Apologies I missed something whilst looking through Bot::BasicBot's code:

#!/usr/bin/perl

package main;

my $bot = Perlbot->new (no_run => 0, server => 'swiftco.dal.net', chan
+nels => ['#randomtestingchannel']);

$SIG{'INT'} = 'Handler';
$SIG{'TERM'} = 'Handler';

sub Handler {
  $bot->{_shutdown} = 1;
  $bot->shutdown('Leaving.');
};

$bot->run;

package Perlbot;
use strict;
use warnings;
use POE;
use base qw(Bot::BasicBot);

sub irc_disconnected_state {
  my $self = $_[OBJECT];
  if ( $self->{_shutdown} ) {
    $poe_kernel->alarm_remove_all();
    $poe_kernel->alias_remove($_) for $poe_kernel->alias_list();
    return;
  }
  $self->SUPER::irc_disconnected_state( @_ );
}

sub irc_error_state {
  my $self = $_[OBJECT];
  if ( $self->{_shutdown} ) {
    $poe_kernel->alarm_remove_all();
    $poe_kernel->alias_remove($_) for $poe_kernel->alias_list();
    return;
  }
  $self->SUPER::irc_error_state( @_ );
}
[download]

It is icky nasty though.

After quitting IRC, it says

^C (in cleanup) Can't call method "post" on an undefined value at /usr/local/lib/perl5/site_perl/5.10.0/Bot/BasicBot.pm line 1500 during global destruction.

This was the same error I had after running exit 0 from irc_error_state