Customizable box for creating renderings

Hi! We love your program and use it all the time, but the actual design space on the screen is so small… and it's not customizable at all. We often take screenshots and send them to the client through email, because if we send the rendering through your software it doesn't give us the whole view. We were wondering if you've ever considered having a LARGER space to create the rendering… or even a customizable rectangle…?