Hey,
With most additional features, we (the core team) have written things like tag support, sql auth and a few other things in extensions first.
We ideally want to build an extension gallery to put this stuff in. If you grab the FunnelWeb source, there is an extension nuget package in there which you can just add and it will set you up with some initial content.
If you have specific questions feel free to ask. Thanks for your interest in extending FunnelWeb.
Cheers,
Jake