Something's been acting a little peculiar... or I'm not sure.
When you select a few bones, the items in the dopesheet become reduced to just those selected bones, and the summary row also changes according to what keys are left in the dopesheet based on the selection.
But what is intended behavior when you select/manipulate/drag/delete the the summary row keys? Does it...
(a) Only modify the keys from the reduced list of bones?
or...
(b) Modify all the keys corresponding to the summary key regardless of their visibility in the dopesheet?
I've been using this for a while and, if I'm not mistaken, it used to work like (a). But lately, it's been working like (b). Not sure if something changed or this is how it's always been and I just haven't been paying attention.
Personally, I like behavior (a). But which one is supposed to be happening?
