Originally Posted by
Trenloe
Just be very sure of where you've made changes so that for future versions of the 5E ruleset you can do a quick compare and see if you need to update your extension.
It's a trade-off - minimizing your XML or LUA reduces the chances of there being a future upgrade causing an issue, but it makes it harder to do a quick compare and see if the code you've used needs to be changed to be compatible with a future upgrade. So, just make sure any changes you make are explaned in comments/additional readme files so that you can refresh your memory in a few months time when you might need to check for compatibility.
Oh, and by-the-way - you need to repackage the new extension. You've zipped from outside of the directory, not inside.