Sure. And the world is a bad place. Did you ever avoid to load a module because it can execute arbitrary code?

I would prefer command-line parameters but if the OP insists loading constants from a module isn't so bad IMHO:

package MyConf {

    use constant NOSE => q(cuke);
    use feature qw(say);
    say __PACKAGE__;
    1;
}
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#!/usr/bin/env perl                                                   

use strict;
use warnings;
use feature qw(say);
use lib q(.);
use MyConf;

say qq(My nose isa @{[MyConf::NOSE]}!);

__END__
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Best regards, Karl