"I want a half teaspoon of sugar in my coffee" was marked wrong. It is a little different, but...
i think half a teaspoon = a half teaspoon
I typed the same sentence, just without the vowels, and it was "almost correct." We don't do vowels here, so why wasn't it all correct?
I think that 'I would like' is in fact the same as 'I want' in this particular case. I was marked wrong by DL.