Yes, currently you can specify a coordinate, e.g. 0 for first and -1 for last, or get all coordinates, but if you want just the first and last coordinates you either need to use two coordinate extractors or extract all coordinates and identify the first and last from the list produced.
Simple, add a coordinate extractor and return the -1 X \\ Y to end attributes. Right click and add an X \\ Y begin attribute, for the values use @XValue() and @YValue(). These will extract the begin index of a line.