My dad refused to allow me to do typing or drama as two of my options because they weren't 'real' subjects. Instead I did geography and chemistry.
I ended up leaving school with 11 O levels. To this day I still don't understand why they all had to be 'proper' subjects.
Apart from choosing your A Level options and or persuing a specific career such as medicine, no one much cares what they are in as long as you have english and maths and the 'core subjects.
In fact the only time anyone has comment on the types of subjects I did at O level was when I went back to work after being off for 5 years after having ds. My boss looked at my CV, said he knew a very nice lady who had gone to my same school, and that I had a lot of O levels and they were all in substantial subjects. By which I took him to mean I'd have had to study hard for them and therefore he deemed me capable of hard work. But I could be completely wrong on that one!
To this day I really wish I'd done drama. And typing, yeah my dad was right you can learn to type yourself. But once you 'learn' to type the wrong way it's very very hard to go back and learn to type correctly.
Anyhow, I guess what I'm saying is, that if your ds has no real desires to follow a specific career path, and is doing the usual suspects of science, english, maths, a humanity subject etc then why not let him choose something he enjoys and really wants to do as a couple of his options?
btw I jacked in my A'levels (another thing my parents pretty much forced on me) after 1 year and went to do a BTEC in business studies. Best thing I ever did.