If there was a seperate area of CPAN set aside for PPMs, I wouldn't have a problem with it. However, everything that is in the modules section should not be a platform-specific package format. Opening up another section (or sub-section) for special package formats is a possibility.
Essentially, I belive anything in the modules section should have the expectation that it can be downloaded and installed via either CPAN.pm or CPANPLUS.pm. There are a few modules which have a complex installation process which are just too much for an auto-install to handle. Such modules shouls explicitly note this fact in the main POD and README. You can still have CPAN as an everything-about-perl repository, it just shouldn't be in the modules section.
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