If, after well articulated research, you can reasonably suggest a lacunae in the originating system, and the querent doesn't explicitly forbid homebrew, you can answer with a "Your system doesn't support your request, but here is some homebrew I wrote, and *here's how it played out in a game I ran.*"

That last bit is really important, by the way.

We require answers that are justified by [good subjective][1] and objective components (if any.) Discussing your homebrew in context in your experiences shows that you've *tested* your homebrew. Since your answer can stand alone *without* the homebrew, due your research into the system showing the absence of support, or the poor implementation of support, adding a "here's how I fixed this problem" is quite good. 

We're not a good community for the *testing* or discussion of homebrew though. 

As a note, if the querent *explicitly* requests potential homebrew, then you're on much safer ground, especially if you can point to similar imaginings and how they worked in other games.

 [1]: http://blog.stackoverflow.com/2010/09/good-subjective-bad-subjective/