It would be great if you could support Alt and Ctrl for turning layers on and off in the Group Services, like we have in Desktop. If we are referencing Map Services, we have a number of layers on and off, but maybe we want to focus on one layer, then we need to turn a bunch off, If you were able to follow what the Desktop team has done and have a shortcut for turning on 1 layer and turning off the rest that were not clicked, the key pressed in Desktop is Alt, if we want to turn all off we click the checkbox next to 1 layer while pressing Ctrl, and all are turned off or on, another capability we can do in Desktop.
