None of these sound good to me. Even if its not on the footpath makes no difference to me when walking with my 5 year old son, as he runs around with the dog and neither of them stick to the footpath!. The number of shoes i have thrown away covered in dog pooh Its especially toxic to kids and can cause blindness
The principle of "stick and flick" is that the poo is flicked into undergrowth/brambles/ditches etc, away from areas that can be accessed by foot traffic of any form; even the most determined toddler/child is put off by a bramble thicket or nettle bed, which is where I flick poo when I am out walking.
As a mother of a young child myself, I know how horrid poo-on-the-shoes can be
Dog poo is not toxic as such (although not pleasant), but it can carry eggs of the common roundworm, which if allowed to develop in the faeces for two or three weeks, can in very rare cases causes toxocariasis in humans - no more than two cases per million every year are recorded. One of the reasons it is so rare is because regular worming of pet dogs has become routine, and the climate in the UK rarely allows the eggs to develop in the faeces - it usually washed away by the rain long before the eggs have chance to develop
There are still very good reasons to worm and clear up after your dog - but the fear of infection/blindness in children is one that needs to be kept in perspective