You are correct that there are parts of the documentation that need to be updated. As with every software project, there is a laundry list of tool and documentation fixes and enhancements to be worked on.
The great thing is, now that BridgePoint is open source, community users can help make the tool better. Documentation would be a great place to start. Let us know if you’re interested in participating in the xtUML development community and we’d be happy to help you get started.
I added an issue to the BridgePoint issue tracker for this request: https://support.onefact.net/redmine/issues/7848