Lots of indexing questions!
The problem we have on changing any of the ingredients definitions is that we have already indexed more than 500,000 recipes. If we now add all the low-fat and no-fat variations of dairy ingredients then all the recipes that have gone before are excluded. So say you look for a recipe containing no-fat cream cheese you would only get the results since we added that ingredient, all the recipes that contain cream cheese would be excluded. Generally we recommend that members check the ingredient listings in their cookbooks before they go shopping. If you aren't able to do that (because you are away from home) then I would have thought the low-fat/low-calorie definition of the recipe or cookbook would advise you that the dairy product listed is low-fat. If you know your recipe is "healthier" then you know the dairy product listed is not full fat.
It is possible that in the future we will add a wiki that will allow members to update ingredients (like the current debate going on in another thread that all eggs should be listed). But for now we do ask members to understand that EYB is a search engine to find recipes using the main ingredients, not a replacement for the ingredient lists in the recipes.
sdanet - the instructions do not tell you to exclude recipes that are also accompaniments to another recipe. If there is a chapter of frostings recipes then you would list each of the frosting recipes separately. If they are an optional accompaniment to a cake then they get listed as an Accompaniment. If they are a listed part of the recipe e.g.Vanilla cake with maple frosting then the ingredients for the frosting are listed with the cake ingredients.
Trackypup - if a sub-recipe as part of another recipe warrants a separate listing then it's no problem to do so. Just put a note as to where the recipe is listed in the book as it is quite likely not to be in the book index if it is not listed as a separate recipe. The other option is to list the category for the sub-recipe e.g. Sauces alongside the main recipe. This way only really works if the sub-recipe is named in the recipe title e.g. Asparagus with Hollandaise sauce. It wouldn't be so obvious with Eggs Benedict that Sauce Hollandaise was included.