Improve viewObjectName determination
Currently \F3\FLOW3\MVC\Controller\ActionController either calls resolveViewObjectName() or uses $this->viewObjectName to determine the view object name.
That means that you'll have to create a view for every action in your controller, or you set $viewObjectName to a general view class. But you can't have both, e.g. use F3\Fluid\View\TemplateView for all actions and your own views for ajax-requests (e.g. @format = 'json').
A possible solution could be:
rename $this->viewObjectName to $this->defaultViewObjectName in ActionController and always check, whether there exists a custom implementation first.