We are starting beta tests of Flowchart.NET v5.6.2. The new features are: 

Dynamic node shapes
Shape instances can be defined using custom code that takes into consideration the current width and height of nodes. This allows creating shapes whose primitive elements change non-uniformly, e.g. by growing only in width or height when a node is resized. There are two ways to create such shapes. The first one is to use the Shape constructor that takes a CreatePathDelegate parameter, which can be implemented using a .NET function. Another Shape constructor takes a string argument that represents a Visio-like shape formula evaluated in run-time. The latter method enables serializing the shape code in external files, which can be reused by different applications and by MindFusion components for other platforms.

SpringLayout improvements
~ Better handling of large nodes and nodes with non-uniform size.
~ The SpringLayout energy model has been changed to one that leads to better symmetry in the arranged graphs. The old model can still be used by setting LayoutMethod to Classic. This is recommended when using rounded links.
~ The Randomize property allows starting the layout process from random node positions.

If anyone is interested in trying the beta, please download this archive, which includes updated assemblies and help file:    
https://mindfusion.eu/_beta/fcnet562.zip

You can just unzip this file into a separate folder and add the folder to the top of your project's reference paths list (there's no msi installer included). Then you can switch to the older version by removing the beta folder from the reference paths or moving it down below the v5.3 path.

I hope that helps,
Stoyan