As I said this camera is for non-seriuos work. Holidays and such. Then a TTL-flash is very handy. I like manual but I am not fanatic about it. And a TTL-flash can still be used in manual mode.
A 35-70 zoom could be a good only lense on a holiday. I agree with you reg prime vs zoom lenses. I have found that when using a TLR, you tend to think about composition a lot more. You get lazier with zooms.