Alex, can we have a RTDirectedLine variant that ends with an arrow shape? Because if I use directed lines sometimes it’s not understandable. For example:

PS: My state machines are cooler than yours :-P 
But you don't have rounded lines with arrow shapes which I do. :-P

I can probably contribute it to Roassal, but I wanted to work on that at ESUG (Camp Roassal), as there's more to the line.