I'm not aware of any syntax to make class field and method lists multi-column; it is not a bad suggestion.
The best I can suggest is to embed two classes inside your actual class, and blank out the names (I don't think you can omit the name field completely), and manually split the fields/methods across them:
(click diagram for online server source)
However, annoyingly, there seems to be a bug where the methods in the inner classes get moved to the outer class!....You could label the methods as {field} as a workaround.