today I stumbled over a very minor feature request. For the publication type Thesis you are already supporting two subtypes, one for Ph.D. thesis and one for Masters Thesis. Do you think it would be useful to add the Habilitation thesis additionally? To be honest I am not sure if it is really necessary to have this subtype as it seems to be very rare. Also you can just omit the subtype such that the citation is still correct. But anyway I do not want to keep this from you thus leaving it here as a request, just in case any one really needs it.