How can noodles (the lines that connect nodes) be changed from straight to curved lines? Unitl now I haven't found the option to enable the curved representation of connectors between nodes. The documentation doesn't mention such an  option. Is there a keyboard shortcut?
The option can be found in User Preferences > Themes under Node Editor:
Higher values will increase the curviness of noodles. Setting it to 0 will make them straight line.

For 2.7#


For 2.8#