Include index as appendix for the more extensive documents
Especially the Studien- und Prüfungsordnungen are quite extensive documents (and the categorizing/scope is messed up quite often--e.g. the use of different words for the same thing or even nastier--the use of one word for really different things). To find things you have to use the table of contents (which only includes headings) or the search function of your PDF reader (which is--in the most cases--not very exact). An index would be a nice solution.
Making indexes is hard to automate (there will be good looking results, but they will be unusable--especially considering (sub)categories)--on the other hand it is a pain in the a-- to do by hand. So this one would take some time...