Thanks to Thomas Holder for the patch:
Auto smooth nodes: a new "auto" node type was added, similar to the one Xara Xtreme has. An auto node is a smooth node which automatically adjusts (rotates and stretches) its handles when this node or its neighbors are moved. This adjustment (same as what you get when you convert node type to Smooth, but continuous) keeps the curve at this node as smooth as possible. It feels a bit like Spiro paths; although not as smooth as a Spiro, it may often be preferable as it works without any Path Effect. Whenever you manually adjust the handles of an auto node or drag the adjacent curve, it loses its auto state and becomes smooth; for this reason, it is recommended to edit smooth nodes with the node handles hidden via a toggle button on the controls bar. Auto nodes are represented by little circles, as opposed to smooth/symmetric nodes (squares) and cusp nodes (diamonds). To convert selected node(s) to auto, press Shift+A or use the corresponding node type button on the controls bar.