You might want to consider looking at Module::Build instead of EU::MM. It makes these sort of customisation very easy. You'd just need to subclass it and do something like (untested):

sub ACTION_testmore {
    runtests( glob( 't/more/*.t' ) );
};

sub ACTION_install {
    my $self = shift;
    # ask your questions here
    $self->SUPER::ACTION_install( @_ );
};
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