This might go along with the Keyboard Driven Workflow and Commands
The shortcut M in the image occlusion editor up without any hotkey to select the letter-specified clozes seems like a missed opportunity. I hope in the future I would be able to have an image that has clozes A, B, and C and when I want to merge A and C, I would just need to press M, B, and A. to do it. Although splitting might make this complicated, one way to circumvent could be designating merged clozes in numerical order such A1, A2, A3.