Good comments, very interesting conversation. I agree that putting in warning for major squicks is a must. 
This is my summary: 
 
On top of that I put warnings and pairing info at the top of every chapter, like this: 
 
Now, after our recent conversation about the definition of slash I may decide to go back and change these warnings slightly. Also, I really like the way Melody does her warnings, I just might borrow from her example.