The latest preview version of the expression scripting package looks really nice!
One small comment I had is that initially, it wasn't clear exactly which attributes of the object were fields, properties, or methods. I realized afterwards that the small icon on the left shows this, which I guess is more common in visual studio, but it would be useful to have the differences in the icons documented.
Another thing that I noticed was that the cursor selection was not working very well, but this could be an issue with wine. For some reason, trying to navigate using the scrollbar kept closing the window. Similarly, when I used to cursor to actually select which method/property, it also just closed the window and didn't select it.