If you go to Edit -> Tool Options -> Decompiler -> Display, you can find options for the display of the decompiler output. One of these options lets you actually replace NULL pointers with NULL! You can also do things like force decimal/hex, change the comment style to single line/C++ style (// comment) comments, change comment indent amount, disable showing type casts (might help if you just want the idea of what code is doing) and some other style things.
I didn't know this existed and it doesn't seem like anyone else did either. :P
