Depends from which version you were upgrading. If it's a bit older, then it's a good idea to do so, especially as Quantenna has been updating their wireless driver in recent releases.
Search for another recent thread or posts where QoS is said to not include the router itself. So, to answer your question? Probably not without a lot of programming and code writing, if it is possible at all.
Had a look at the OpenVPN app and it's one of the most ugliest apps I've seen (looks like an app from the earlier days of Android) but it might do its job ok.
But if someone spent that little time on the UI, how much time have they spent on the code keeping it secure etc?
What is the options for us that wanna stick with iOS. Running a L2PT server behine our AC87?
Never judge software by it's UI if the UI is not the important part of the software. There are many VERY capable programmers out there who are just not good at making UIs or who don't even bother. That doesn't mean the software is bad.