I am looking into the matter and will post when I have more info
EDIT: I dont see any easy way to remove the cached version of the added section names, upon quick glance I did not see the values being stored in any default ini at the project level.
There do not appear to be any built in functions for deleting a section, if someone finds such a function let me know!
Anyone who has more to look into , please investigate ConfigCacheIni.h and also see if they can find where the saved version of the sections and values is going!