First, about creating "wanted" or "red" categories. There are currently about 750 wanted categories; it used to be more, over 1000 wanted categories. Off the top of my head there were four of five Categorization project members listed as volunteers to work on those. 750 or 1000 categories to address is a lot of work for just 4 or 5 people.
The number of wanted categories is slowly decreasing since the new Category button was added to the profile editing page. Now, if you attempt to save a profile which contains a non-existent category, you will see a big red banner warning you that the category does not exist. If you choose to save anyway, you are creating a red category, which you can either create immediately or leave in red, thereby creating more work for the 4 or 5 volunteers mentioned above. Personnally - this is the way I work - if I see the red warning, I will double check that the category is right and that it should be created before going on to save the profile. Is there a typo? Can I check the likely parent category for a similar category with a different wording? I frequently create new categories for French communes, so I see this red banner a lot. But if the red banner is for a category linked to a project I'm not so familiar with, I will definitely do some research to find out if there is already an existing category.
You mention that the records were in German prior to 1792. But you place Sundhausen in Bas-Rhin, which was only created in 1790. If you need a category for just 2 years, in my opinion it really needs to be discussed. There will probably not be a big number of profiles to fit in a category that represents 2 years of the history of a village, so perhaps a better solution could be found? The goal of categories is usually to group profiles together for a genealogical propose - they're not supposed to give information or historical context, for instance, to profiles. They're all about collaboration, so they must be simple enough that other users will be able to find them and use them.
As for the genealogical purpose and making research, it would certainly help to know what the source is? For this area, I am only familiar with Archives du Bas-Rhin. If you enter "Sundhausen" in their search engine, you get no reply. The site only recognizes Sundhouse. So, to really help research, the important thing is to indicate that to find information on this Sundhausen (there are several places named Sundhausen), it is necessary to look up under Sundhouse. Incidentally, I sampled the pre-1792 records for Sundhouse, and found that most of them are in Latin, with only a few in German (which is why I suppose you have access to another source).
About Amt Wolfishiem - I suppose you mean Amt Wolfisheim? I'm not really familiar with these Amts, which would no longer concern Alsatian towns after their annexion by France (which in the case of Sundhouse was in 1697 at the latest). Since this one covered a territory that is now (in part) in France, I tried to look it up. The Wikipedia entry for it (in German) lists several places that were in it, but not Sundhouse or Sundhausen. It may not be a complete list though. Again,a complete list of the places that were under this Amt would be quite useful and appreciated, if you have one.