Sublime text highlights function calls to members or built-ins. Shouldn't this be possible here as well. Other issues say it's impossible to distinguish between built-ins and class members - why not highlight both. It looks more readable than a bunch of white text.

Sublime Text

Magic Python

Is this hard to do? Are there any user settings I can do to make this work?

Couldn't you just highlight anything in front of ()?
This is what sublime text is doing.