Feature request: Flexible DataSource

[cloakedch]

It would be great if one could use the DataSource in a flexible way.

Let's assume that I would like to update / edit a row and send the updates to a server. I would PUT the changes to the server and use the response data to be the actual change in the local data source.
Now, this can already be achieved with the existing createConfirm, editConfirm and deleteConfirm EventEmitters, but this is the wrong place, as these methods have to be placed in the Component and not in a separate Data Adapter (Separation of Concerns).
It would be better if one could extend a flexible DataSource and then use custom logic to do the server magic.