All you need to do is to build your @EXPORT array dynamically after defining all of your functions.

use strict;

package MyModule;
use vars qw(@ISA @EXPORT);

require Exporter;
@ISA = qw(Exporter);

sub test { print "In test\n" };

sub test_again { print "In test_again\n" };

sub last_test{ print "In last_test\n" };

while (my ($name, $glob) = each %MyModule::) {
  push @EXPORT, $name if defined *$glob{CODE};
}

1;
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