I'm not as experienced in map-making, but I have made plenty of my own maps before, for private use, and I can agree that; rotating the objects to get the angle that you just need is very frustrating. I think it'd be a great idea to include a solution that would create an easier way for players / map-makers to set angles for various objects.
However, I'm no coder, and not sure if it'll be easy to include. It'd be helpful though~