It'd be useful if it were possible to add little ports to the edge of nodes and adjust their color to signify a flow direction. This could be used for conditional nodes, rather having to work around it by creating additional nodes or adding text to the flow arrow.
I am not exactly sure what you mean. Maybe allow customization of the arrow starting and ending points? Coloring the arrows is a feature we were also planning to allow.
Coloring would be super useful as well.
Here are a few images of what I'm thinking;
Or something more custom like, input & output ports to display nesting and passing of data;
https://ludiq.io/bolt/manual/flow/super-units 
