Nuok created a loot roll plugin previous to 5.4 and it appears they have since stopped playing/updating the plugin. I came across it while looking for something to do exactly this and noticed it was not updated for 5.4, so I added the bosses for SoO as well as Ordos and Celestials... ENJOY! https://luckydo.googlecode.com/svn/trunk/
This is exactly what I was looking for, great job! One suggestion is that I would prefer the setting menu to be check boxes as opposed to drop down menus. It takes a decent amount of effort to set all but a few bosses to false.
I simply updated the plugin to include the additional bosses, I honestly have no clue as to how to change it to checkboxes over dropdowns. Maybe if a dev wants to help me out.