yupswing
Ability to turn off shadows or change angle
Turning off the shadow makes the picture really flat and lose the purpose of pretending to be 3D. You can see that when you edit the model and (to lower the computational demand) the shadow are not computed.
About the angle change, that is quite difficult. The current engine draws the scene in a way that certain slope orientations are not possible (you can see that since some primitives are missing). The only way to make the scene angle change (still only 90 deg steps) is to rewrite the current renderer.
Also, I would like to point out that TileCraft is just a prototype with little chance to become a real product since I have really little time to dedicate to its development.
Ok. No worries. Shame you have limited time because it's a fantastic implementation.