Version 2.2 of ReqIF Studio just got released. It contains a new feature that allows the configuration for a specific ReqIF file to be written in a separate file, rather than the ReqIF file. This makes it easier to work in a team, when using a versioning system. Access it via Window | Preferences | ReqIF | Store settings in ReqIF file.
If you already have ReqIF Studio installed, the tool should notify you of the update (or check via Help | Check for Updates). Or download ReqIF Studio, if you have not done so yet – it's free.