Hi Tobias,
there is no option to disable epub in the recipe.
Downloading the epub is an integral part of the recipe, since the epub is used to "cheat" the recipe mechanism. This mechanism takes an unzipped epub and then makes all conversions the user may have specified -- in your case it may create even a mobi file. There is no way to tell calibre not to build an entry with this epub (and mobi) file.
The recipe does additionally download the pdf version of the Zeit, the Magazin and the Beilage, and create new database entries for the three logical books. This is the part where one can enable/disable formats. I did not include an option to not include the epub, since it is downloaded anyway, but I could indeed include this option.
If all is enabled, the recipe, when called from within the calibre GUI, will therefore create 4 new book entries. The Zeit will have two entries due to the above cheating thing - you will have to delete the doubled entry by hand.
When called from the commandline, it will create 3 new book entries and create a new epub file. This epub file is the one resulting from cheating the recipe mechanism.
Code:
ebook-convert Zeit\ Premium\ All\ Formats.recipe Zeit.epub --password=PWD --username=USER
I hope this clarifies a bit
Cheers
Achim