kane (CPANPLUS author) told me that I can use /cs in the latest version of CPANPLUS to do this, I just did: 
/cs --add file:///path/to/my/modules/
Where /path/to/my/modules contains a bunch of .tar.gz packages.

In reply to Re: How do I get CPANPLUS (or some other tool) to resolve dependencies when installing local .tar.gz packages? by Anonymous Monk
in thread How do I get CPANPLUS (or some other tool) to resolve dependencies when installing local .tar.gz packages? by avar

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