Okay. As I said in my comment further down, I suppose this depends on your linguistic surroundings when you learned to speak.
To me using 'were' in the incorrect mood feels wrong. I'm not a strict grammarian (I had to look that reference up to double-check before posting), and my feel for grammar is intuitive rather than learned from verb tables. Obviously the verb-tables (or fragments of them) are encoded in that haze of language in some latent form, but it's entirely down to the environment in which I learned to speak.
Acquisition of grammar is a fascinating topic. Can anyone can recommend any books on the subject?