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Aren't parsed again themselves? Why again? It seems globals are not parsed at all!

Is there any reason why you did not wanted to parse it?
I think parsing the globals is a necessary thing (or at least to make it available optionally).
And I don't think, that there are any disadvantage of parsing the globals. Are there?
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Globals are perl code or simple strings.....the parser is a template parser.

If you parsed it again it would be doing twice the amount of parsing and would slow things down considerably.

I don't unserstand why you'd want to do it. Any output created by a tag can be done with perl code anyway without loading the parser.

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Finally, if we don't do parsing globals, we are not able to include any menu file in the left table column.
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Of course you can. You know how to use open() and close() right?