Especially when using an enumerated value in the expression of an exclusive split action, it should be possible to limit the list of values.
Because on the left hand side of the expression the type of attribute (enumeration) is know, there is no need to display more than can be assigned / evaluated.
Now if you don't know the entire name of the enumeration, you'll have to look it up by inspecting the attribute or you'll have to check the entire list. Which takes more time than necessary.
So instead of:
You should get, something like: