Others have developed easy deploy for selenium. But usually we avoid doing so as there's already mechanisms to do so.
But in particular here with the standalone server, there's nothing to "install". So the homebrew recipe doesn't make sense to us. You install java. You download selenium-server-standalone and run it with java. So installing can be as easy as a curl command?
My personal opinion is to not auto-update tooling I require when doing development. I prefer distinct upgrades to help identify where regressions may be occurring.
This is not to say others won't be attempting to do this, but I don't believe any project members are planning on doing anything further with our distribution of releases.