Do you track what you eat? if so, how

I scanned the food diary daily sheet the docs gave me as part of our info package, reduced it and printed it off to use in my planner.

I've used Fitday online, Fitday local, and Calorie King local. I prefer calorie king but a critical feature all of them are missing for me is the ability to enter negative foods.

If I go to Burger King and have a Whopper (no, won't be doing that anymore, but in the past I did) I eat it without Mayo. This has a large effect on the calories, and if I could just enter
Whopper x 1
tbsp Mayo x -1 I would be good to go, bug instead I have to build the burger from scratch, meat, lettuce, buns, tomatoe, ketchup, etc.

I have asked both of their programmers to add this simple feature (all they have to do is stop rejecting negative numbers) but they don't even respond to me. As a programmer myself it's a shame to see them neglect such an important and easy to implement feature.

After all, it's software mostly used by dieters, and how many dieter out there ask for a normal meal, "hold the mayo" or "hold the cheese" etc to reduce our calories?

I used fitday online for over a year post-WLS and liked it a lot. For a "negative food" as you described I would just create a custom food such as "whopper w/o mayo." Enter it once as one item (just excluding the mayo calories, fat, etc.) then use it over and over. Boner 

That's exactly what I do, create a custom food. It would just be a lot faster to be able to negate one component of a meal already in their database.