If you want to inherit, use base. If you want to import, call import. (If you want to import constants and benefit from constant folding, use use to import.) Those are the simple ideas.

use MyOOModule qw/ THE CONSTANTS /;
use base 'MyOOModule';
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Personally I almost always name what I import, so that when I or someone else return to the code, it'll be clear from where a function was imported.

For similar reasons I'd like to advice against using import to set up inheritance unless you really have to, since that is what base is for, and it'll surprise people who read your code.

ihb