I'm not sure I'm understanding your situation, but if you want a function in IPC::MM::Scalar autoloaded, you should have an IPC::MM::Scalar::AUTOLOAD subroutine. Since I suspect you don't need the constant() stuff in that package, you could just do (in a Scalar.pm file):

    package IPC::MM::Scalar;
    use AutoLoader 'AUTOLOAD';
    1;
    __END__
    sub TIESCALAR {
    ...
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