Okay if you don't know all the functions of Radiant by now...please get to know them all. There are some REALLY cool tools like the one I obviously missed called the FREE ROTATION button. It has blue arrows on it and looks like a funky version of the YIN and YANG symbol. Using this will turn your brush purple (default color). Then just drag it to whatever postion you want in ANY view.
Use this carefully! If you are not in the smallest grid size available you might end up getting an error or end up distorting the brush too much. So experiment with this tool.
If I had known about it earlier it would have saved ARBITRARY rotation about 50 times!!
[EDIT] SPELLING AGAIN!! [/EDIT]