Modifying maya's default project folder structure

Hello everyone, I was wondering, is there a eay to change maya's default folder structure for projects. For example, I want to store shots and their preview files inside one folder and not in separate folders (i.e. images, scenes, etc.) So is there a way to achieve this? Does mel or python provide such commands? Also, how can modify workspace.mel after setting these rules? To be specific, i'd like tp save the previews into completely different folders and subfolders, despite maya default /images/.