Right now if you're a Res user that uses a computer with a small screen when buying anything in the main shops the box that pops up is too big for the screen, thus forcing you to full screen your web browser, if you are even able to do so.

What I'm suggesting is an option in your account that you can turn on that, rather than opening a pop up on the screen to purchase items, that it redirect to a new page to purchase them. And to keep the feature from being abused via refresh, something that only makes it valid when you click on it from the shop itself. Subeta.net has a similar feature now in their main shops that if you go back/refresh after buying something it tells you that the page has expired.