I would probably favor QuickMemoPlus::MemoExtract because I don't like mixing snake case and camel case if I can help it. (Doing so comes in handy sometimes, but this doesn't seem like that time.) I don't think that the name LG adds anything. QuickMemo+ is the software you're targeting, and Extracting a Memo is what you're doing.
We will never know if it's needed on CPAN, but its existence on CPAN wouldn't be wrong. Try to make it a model citizen, though; a good test suite, good documentation, etc. That way even if it doesn't get used heavily, or at all, it can stand as an example of a well crafted distribution.