Pretty simple idea. Currently, the Command ( ` ) (or tilde key, or, the one to the left of the number 1 on the keyboard) switches to the next open design file. This is awesome functionality, and I love that it is the same as with Adobe products. One small gripe is that it stops when it gets to the end of the list of open design files. For me this feature is best utilized when I am switching between two open files, so it would be great if you get to the end of open design files list, then it goes back to the beginning.
Thanks!