Final answer:
The keyboard shortcut for the roll trim tool is not standardized and varies by software; for example, Adobe Premiere Pro uses the 'N' key for the roll trim tool. Always refer to the software's manual or help guide for the correct shortcut.
Step-by-step explanation:
The keyboard shortcut for the roll trim tool can vary depending on the software you are using. However, generally speaking, there is no widely recognized standard shortcut called the roll trim tool in most applications, and keyboard shortcuts like Ctrl + T, Alt + R, Shift + M, or Ctrl + Shift + R often perform different functions.
For example, in Adobe Premiere Pro, the roll trim tool can be selected with the N key, but this could be different in other video editing software. It’s best to consult the specific software’s manual or help guide for accurate information.