Board Thread:Support Requests - Getting Started/@comment-4146635-20131210032320/@comment-16101931-20131210041840

The VisualEditor feature is brand new and still in development. It is far from finished. That is why it's listed in Special:WikiFeatures under Labs -- as the description there explains, those are experimental features and users are encouraged to give feedback to help improve them using the "Give Feedback" button below each of them.

Wikia's developers do not regularly check these forums, if you want them to see your comments, you should use that "Give Feedback" button.

Furthermore, I do believe they are trying to get that to work. It looks like it is supposed to list unused parameters underneath "Add parameter", which you would be able to select. So no, they don't expect users to know what parameters to add, they just haven't gotten that working yet.