I'm puzzled as to why you would want to do anything about this. You say that perllocal.pod is growing "rather large"; how large is that? Is it taking up a sizable portion of your disk? Are processes slowing down as a consequence?

I confess that I had completely forgotten about the existence of perllocal until I saw your post. I checked my own instance of that .pod -- 15 months worth of installs -- and it didn't seem very large. In fact, it's much smaller than the POD of some of the modules I've installed. And when I want to read the documentation for My::Module, I simply call perldoc My::Module.

I don't see what's broken, so I don't see what there is to fix?