In AC, if I want to draw a line at a specific angle (without the hassle of changing standard settings), all I have to do after I have clicked on the start point is enter "

You can do something similar in DS providing you enter the length of the line before the angle.  Trouble is, you often don't know the length and what you want is effectively a ray which you can trim to length later.  For that, DS seems to have no answer.  Or am I wrong?