increase the length of the current keyframe using shortcuts for greasse pencil

In animation for timings often have to increase the length of the just drawn frame, and use shortcuts that-to increase or decrease the length of the current frame at times increases the work.

This can be done manually with a mouse, but it will be slower and not just so in all other programs for this there are shortcuts.

If you select all frames and press e, you can move the frames to the right increasing or decreasing the distance relative to the time line, but again only with the mouse and there are no shortcuts for this that would be much faster.

This is the only thing from what I want to use other programs, because it increases the speed of animation in times.

If you make a script that would select all the frames would press e and relative to the time line would move all the frames ahead forward or backward it would already work, but I do not know programming and whether it is possible.

Therefore, I hope this function, which is in all other animation programs will also be added to the wonderful blender, and I hope everyone who reads like this request that-that it will be noticed and more animators used blender