If you look to the left of the wall editor there is a set of entries under \"Grid/Snap. Enter the numbers according to your need for wall angles there. I use 15 deg in this it will snap at 15 deg intervals if you have the snap settings on in the right mouse menu.
Rodney,
When I create angled walls I right click and un-check ortho, then drag the wall in the general direction want it to go and click. The dimension box will highlight and I enter the length of the wall then tab to the angle box which highlights and enter the angle which will be either 45 or 315 or 225 or 135 depending on which way I am dragging the wall for a 45 degree wall. Hit \"Enter\" on your keyboard to accept the numerical entry. You can go back and highlight the angle entry and change it at any time after you select to edit a wall.
After creating the angled wall I right click and check ortho to create right angled walls again.