Once again, you can't control the printer dialog without a print script but you can control it in a print script (it does not change the default printer settings). So for example, if you want to automatically open the printer dialog when the document opens and have the reverse pages box checked, you would do it like this:
var pp=this.getPrintParams();
pp.reversePages=true;
this.print(pp);
If you are going to do this there is no need to for a code to uncheck the reverse pages box because this code didn't change the default settings. It only changed it for this print job. If you try to control it by skipping the last line of code, it won't do anything (run the first 2 lines, then click the Adobe printer icon and you will see the original settings).
Another solution is to write a code for a will print action that reverses the page order and run the same code in the did print action (to restore the page order after the document prints) but this will not work with Reader because you can't manipulate the page order like this in Reader.