Module updating etiquette

Let’s say you’ve stumbled over a module and wants to make a few tweaks (and eventually publish), but cannot get a hold of the original designer. What is the etiquette here?

The designer’s guide says:

I believe also you do not remove the previous module versions, though I cannot find where I saw that. However that makes sense to me as VASSAL does not handle version changes well and people may need old versions of modules.

Many thanks. I shall tweak to my heart’s content.