Won’t fix UE-55470 either (Unreal Engine Issues and Bug Tracker (UE-55470) ), no idea why though.
52056: “If you close the editor and then reopen the broken blueprint it prompts you to delete the broken variable. … you normally wouldn’t do force delete”
55470: “These are windows shortcuts and cannot be implemented.”
Does the keybind work on a different OS? Also noticed that in Battlegrounds (which is made with ue4) you can use alt+space without a problem, so it shouldn’t be impossible to implement.