The GEtax does not clarify what you can claim. On the contrary, if you are quasi-resident. It is just the standard way that all Geneva residents fill in their tax. Many of the parts that you must fill in are totally irrelevant to your quasi-resident tax claim. Requesting that you fill it all in is just a method to keep the number of claims down.
Here are the people that I used:
http://www.quasi-resident.ch/
They offer a free online assessment, which can't be bad. Easy to find, it's in the same building as Lamborghini...