Wait what?
When I tried DSQ Tweaker there were NO possible ways of editing animations.
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How2 use it properly?
Open m.dts
Open an animation.dsq
DSQ Nodes, second tab
Right click on the name of a node like RightArm and click "Edit Rotations"
If it does not rotate in the animation you chose, you may not be able to edit it. For example in this video for the head movements I had to also use the undo animation and select "Cyclic" because the run animation does not move the head. Some of the animations let you rotate things that don't appear to rotate in that animation.
You can change the duration in DSQ Sequence so that it matches the length of other animations you view or edit. You can begin with one animation and then have it named under another animation so that it's more convenient to trigger (e.g. use m_look for cycled hip rotations and save it under m_activate, and a note, m_look seems to translate the entire body a little bit, so you'll get some odd movements which may or may not be noticeable when you use that in a cycle).
It seems you are unable to add frames or translations.