I find that with a long statement like that, the modifier gets lost. A casual peruser might not notice there's a loop there at all. It's a little better if the modifier gets its own line like so:

$slide = $ppt->Slides->Add($_, ppLayoutBlank)
    for 1..4;
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I like temporary variables too. Usually when $_ appears, it's a comprehension vortex. In this case, the variable ($i) is not much better, but sometimes a good name on a variable can add a lot of documentation. For example,

foreach my $good_guy ( @ARGV ) {
    push @my_attr, get_attributes( $good_guy );
}
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