To rename a region, select the region and press Shift-Apple-R. This shortcut by itself doesn’t save a ton of time, because you can also just double click on the region to bring up the rename dialog. However, when renaming a large group of regions, such as a group of splits for a song / spot / movie, if you select all the regions and press Shift-Apple-R, Pro Tools will automatically cycle to the next region after you rename one. The order in which the regions will cycle follows the sorting in the region bin. This workflow has the potential to save you a lot of time if you regularly name groups of regions. Happy Renaming!!