This Add-on is in beta. If you have any question. Kindly let me know.

"blank_frame_manager.py" is a handy add-on for helping animators quickly add blank/empty frames ( not keyframe ) in between keyframes during object and pose mode. /nDemo: https://youtu.be/4FL3Wb2bpNk

New Updated: Add key unlocked button only key unlocked attrs

Suggestions: If you want to use hot key. I found this setting is less changed and suit for animating. Add blank: ctrl + Numpad+ Remove blank: ctrl + Numpad- Key Unlocked: ctrl + I

If you are new to blender. you may try the "Blender_blankKey.py". I've setting Object/Pose/Dopesheet/GraphEditor with the hot key below.