I don't know that I've ever seen rules. In general, you pick the correct forum to post in based on the version you wrote the modification for (version 3.0, 3.6, or 3.7) and then whether it is an add-on (a product with code changes) or a template mod (only a change in templates). After you fill out the thread info, you get taken to a form where you pick things like the category (see the drop-down at the top of the modification forums) and things like whether you support it, if others can use the code, etc.
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