We are moving to an open code model, with a few options. One of them was introduced in 8.1 you can see the beta of the SharePoint server connector, where the code is fully customizable for indexing, syncing, you name it. SharePoint Server connector package I will open up a thread topic for the other type of customizable connector type that will have an underlying connector framework that will be in technical preview. what type of functionality are you looking to modify?