Ah yes I created a module for preorder items
And I can't tell you how to do what you want
cause I'm working in other things in my web, I and still didn't reach that point
like the sections of each...
Is just to add an if quantity<=0 }peorder{else etc
I supose
but it have not too much sense, cause what will happen when you really will be outofstock?
I have the backorder when i accept orders when in zeros
preorder, before the product is realesed, also in zeros but with an specified date for everyone
sorry if my english is worst than yours lol
I also speak spanish and a little of french
if you want to contact me