One thing that I am wondering/hoping could be fixed:
Sometimes there are Unicode or other "odd" characters in RSS feed titles. These are not displayed properly by Vienna. They come out as garbled text. Here is an example (from The Oatmeal)
Actual:

How it looks in Vienna:

Is this something that can be fixed?
edit: btw I'm using Vienna 3.1.15 :9729aef5: on macOS 10.12.6