yes you can use f4 but you'll not be able to get all the fine details when they look like a veil (sorry English not my language too) by using a very short duration (1 to 3sec), also you can get pin point stars and that (IMHO) more beautifull.
same thing for Milky Way, when you don't want to use a tracker (or if you don't have), it's a lot easier with big aperture to get pin point stars
last but not least, about IS : I try to travel to make pics and weight is limited, so I also use this lens for landscape, so if it has IS it's better for me.
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