insert sequence

[Johnly1986]

Now in the sequence editor, you can easily drag a key frame to change the time, but sometimes I want to drag a frame to make the subsequent frames automatically move back. Is there such a function?
I tried holding down shift to select all the subsequent frames, but it becomes very troublesome when there are a lot of frames, and shift cannot select key frames outside the window.
please help me

[excitedbox]

It would be good to have a virtual keyframe/marker that selects the whole sequence. Some systems have a different shape symbol in the center of a sequence for this purpose.

[Johnly1986]

When there are a lot of keyframes (hundreds), it becomes extremely difficult to operate the sequence, and dragging these keyframes is very stuck. I hope the author will optimize it.