Shouldn't putting them all on one line work? Like 
o conf makepl_arg LIB=/path/to/my/distros/perllib PREFIX=--perl_only

[download]

Update: Or edit ~/.cpan/CPAN/MyConfig.pm directly and set the things you need from there.

-- Hofmator

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In reply to Re^3: CPAN shell - passing params for module installation by Hofmator
in thread CPAN shell - passing params for module installation by skazat

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