Hey Mark,
The short answer is nyet.
If there were I imagine @Peter_Morgan would have mentioned it.
The Keyboard Maestro Forum is a user-forum not a library. Many macros are offered for posterity and are not maintained. Many macros are offered to help accomplish someone's task du jour.
Only a few macros on the forum are regularly maintained and/or augmented by their authors.
You can find a few of them in this listing:
-Chris