Blender Dope Sheet and Graph Editor

Great tutorial!

can u pl clarify my doubt.. I have 7 cubes animated in rotation X. i want to make time dilation for each. Means each will have different timing. I selected the all 7 cubes in camera view and opened dopesheet. When i selected the cube2's key, all other Cubes's keys are getting selected. can you tell me, how to select only one cube's key amongst all other cubes in dopesheet ??

what about a psa file? i wanna scrape the separate anims out of a one lump file
how would i do that?