You normally only have one dragger behavior per puppet. That controls all the draggers on the puppet at the same time.
Draggers cannot be keyframed, but you can blend them. Eg, you can record a drag to a point then do tricks like extend the right edge of the recording (it effectively holds the last value) then you can drag the left edge to the right as well (throwing away the start of the recording). The end result is a take that is the hold value and nothing else. Once you have this take, do a few more for all the key frame points you want. If you click in the middle of the take, you can slide it left and right (instead of adjusting the length). Line a few up so they overlap by up to half of the take length. Then, in the upper take, in the top corners there is a little square - if you carefully click on the square and drag towards the middle of the take it will create a 'blend'. Instead of a blue rectangle, the end should show a sloped shape. This will blend between the lower take on the screen and that take, doing a smooth transition between the points. Before keyframes were added, this was the only way to do it. It works with draggers nicely.
Here is an example video of blends (boy, i waffle i lot looking back!) - not using draggers, but might still show how to do blends https://youtu.be/BFR2HbZ_G4k
'Using keyframes, you can put a transform behavior on a hand etc then keyframe the position x/y etc values, but you have to do the rotation yourself. It does work, but it can look less natural (to me).
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