Anvart (this is his brainchild, not mine) has provided what is probably the simplest approach.
In \SilentHunterIII\data\Cfg\Commands_en.cfg file
Insert the following line in [Cmd70] section.
[Cmd70]
Name=Cam_zoom_in
Ctxt=1
Key0=0x05,cR,"CTRL M.wheel" <-------- Insert this line
Normally, you zoom in and out by rolling your mouse wheel forward or back.
If you hold down the Control key while doing this, you will go through a series of incremental zoom levels from 1x to 10x in the UZO, Attack scope and Binoculars.
On your second question, GWX is one large mod and you can't pick and choose parts of it. There are, however, a number of mods for it to change things you don't like.
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