Still not disabled! Although at this point we're so habituated to PRs as a team that in practice it never happens. We did finally disable force pushes to master, though. Don't miss those one bit.
How would you even disable that in github?
It is very easy to only allow others to pull your repository. It then functions much the same way as an open source project where pull requests are required to get code into the main repo.
Yes, but you can't restrict push access to a branch ("restrict master") unless I'm missing something?