I do quite a bit, because usually it is hand-in-hand with editing the ruleset to try and "fix" things that I think could work better. Like when I decided to try and create custom spell lists for each individual deity based on their portfolio, there was a setting / location that I worked on for that to be used in. I've also done the same when designing rules for the Battlemaster maneuvers to be a universal mechanic for all the martial classes, there was setting material created in and amongst it.
But usually what ends up happening is that the more I work on these rulesets, the more I actually delve in to thinking about what their function would be and how they would get used... and I usually come to the realization that while * I * would embrace the rulesets and work them to their fullest... the people I play with just don't have the same noodly need for changes and fixes like I do, and thus they would not engage with these rules and settings any differently than just using the standard rules. Despite any changes, the players would make the game feel the same and thus everything I did would end up being ultimately a waste of time. At that point I usually just default back to using the standard rules because it is easier and thus the setting material gets shelved along with the houserules.
But at least spending all that time futzing and creating helps cleanse my brain of it, which allows me to just use the game as-is and let go of any niggling annoyances I might otherwise get stuck on.
But usually what ends up happening is that the more I work on these rulesets, the more I actually delve in to thinking about what their function would be and how they would get used... and I usually come to the realization that while * I * would embrace the rulesets and work them to their fullest... the people I play with just don't have the same noodly need for changes and fixes like I do, and thus they would not engage with these rules and settings any differently than just using the standard rules. Despite any changes, the players would make the game feel the same and thus everything I did would end up being ultimately a waste of time. At that point I usually just default back to using the standard rules because it is easier and thus the setting material gets shelved along with the houserules.
But at least spending all that time futzing and creating helps cleanse my brain of it, which allows me to just use the game as-is and let go of any niggling annoyances I might otherwise get stuck on.