use "I can't believe its not cornflour"
yes
Yes, it does matter you have to use self rising dough to make salt dough. I think
A little cornflour will do the trick.
To make flie dough you use water and flour. This is great for flie fishing.
I personally would use normal cornflour instead because wheaten cornflour is really hard to find but you may wish to use something else.
diabetic people can use cornflour and custurd powder?
No. Croissants are made with a puff pastry dough. You can make butterhorn rolls with bread dough, but they are not the same thing.
you use cornflour instead but it dosent work as well
Not in all recipes; for most baking recipes substituting plain flour for cornflour will not work, since cornflour has no gluten (which is what makes dough springy) and it requires far more hydration. Adding some cornflour to the flour in baking will result in lighter baked goods, but only until the total flour is 5% cornflour; after that the baked good gets progressively more dense and inedible. Cornflour is useful for thickening custards, which plain flour is not so good at. But you cannot bake normally with cornflour. Both cornflour and wheat flour have a similar calorie content, wheatflour is lower in the glycemic load (GL) index compared to cornflour, and whereas cornflour is considered "highly inflammitory" (i.e likely to cause a reaction), wheatflour is only considered "inflammitory."
they needed the ingredents dough sauce cheese and pepperoni to make their pizza
Either salt, or vanilla extract; or the dough-ish thing you use to make it actually play-dough.