I like that. The only problem that I see is that the base class also has functions that it exports and, under certain circumstances, will AUTOLOAD functions that don't exist, but which the client requests be exported. To get around that, I think I would need to trap those functions that I need, set the globals, and remove those functions from the import list. What do you think about the following (also untested :) code?

package Foo::Bar;
sub import {
    my %handlers = (
        DEFAULT_XFR => \&set_xfr,
        NO_LOG      => \&disable_logging
    );

    my @args;
    for my $i ( 1 .. $#_ ) {
        push(@args, [ $_[$i], $i ]), next if $_[$i] eq 'DEFAULT_XFR';
        push(@args, [ $_[$i], $i ]), next if $_[$i] eq 'NO_LOG';
    }
    # two loops because we don't want to splice @_ while looping over 
+it
    foreach my $arg ( @args ) {
        if ( exists $handlers( $arg->[0] ) ) {
            $handlers( $arg->[0] )->( $arg->[1], @_ );
        }
    }
    Foo::Bar->export_to_level( 1, @_ );
}

sub set_xfr {
    my $index = shift;
    if ( defined $_[$index + 1]  and $_[$index + 1] =~ /^([A-Z]\d{4,5}
+)$/ ) {
        $Foo::DEFAULT_XFR = $1;
        splice @_, $index, 2;
    } else {
        $Foo::DEFAULT_XFR = 'H00293';
        splice @_, $index, 1;
    }
} 

sub disable_logging {
    # same concept;
}
[download]

Cheers,
Ovid

Update: I'd also need to set a flag to see if the module was required instead of used. A require won't call the import() method, thus necessitating that the INIT() function still remain as a fall-back (and it would only fire if the import wasn't called).

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