According to what i know about mod_perl, what you want shouldn't matter. The first time yer script is hit, the script is compiled into byte code, including any modules associated with it. So there would be no need to have the module loaded by anything higher. Infact, that may be bad if you ran into issues with changing the library.
to import your modules, as that explicitly shows that you aren't going to do any hanky panky with the namespaces.