I'm not sure if I understood correctly what you mean. The Sprites editor lets me select multiple selection and I use this to assigning the selection to a view. It gives options such as overwriting or adding the frames to an existing loop, and also to set all frames as flipped or to add them in reverse order. I only find that it missing one option which is to set a certain delay for all the frames in this process.
EDIT:
Sorry, I mistook the Sprite and the View editor when I read your reply. I originally talked about the Sprite editor so the delay could be set at the same time when assigning the frames to a View. But if as you said the View editor will allow selecting of multiple frames that could do the trick as well, in addition to also allow deleting / flipping of multiple frames.
EDIT:
Sorry, I mistook the Sprite and the View editor when I read your reply. I originally talked about the Sprite editor so the delay could be set at the same time when assigning the frames to a View. But if as you said the View editor will allow selecting of multiple frames that could do the trick as well, in addition to also allow deleting / flipping of multiple frames.