Auto resizing

Saw it posted back in 2012 but still can't seem to find the option to have fences autoresize depending on how many icons are in them. I just created a fence for unsorted desktop items and i don't want it large but i don't want it small either and i can't think of how big i want it exactly so i'd like it to just automatically expand as icons are added to it (Up to a defined max size or until it "bumps" into another fence or edge of screen) I love fences and have been using it for over a year but that's the only feature i really want.