Modifying and expanding filters

Hmmm. I didn't even think to ask when I updated Emme's Landform filter. I think I read something about a filter needing to improve on or extend functionality without greatly altering the user experience when submitting a modified filter. The gist of it was that you do not submit a simple variation on an existing filter. It did not say "your own filter" explicitly, so I implicitly took that to mean I could use a filter as a starting point and branch off... and the branch was accepted to the filter library.

So, there's at least one precedent. I know there's a lot of sharing and branching going on in forum threads, too. For personal use, I'd say the sky is the limit, and if you want to submit to the library, submit it to a forum thread of your own to get people's yay or nay.

Will keep all that in mind and thank you for the replies.
Absolutely will make sure to give credit for the starting point.