While I don't have an answer to your question, I do have a question for you - why are you using the typeglob to begin with? I would, instead, do something like:

use FileHandle;

    my $out = new FileHandle ">&STDOUT";
    autoflush $out;

    my $in = new FileHandle "<&STDIN";
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That way, you don't have any typeglob confusion.

Now, the method above doesn't work in Win32 the way it does in Unix, cause you cannot select on $in. (Of course, I have a sneaking suspicion that you cannot select on STDIN, no matter how you try to do it, but that's neither here nor there...)