Special priority request from Durian team to get this sub-editor of the DopeSheet Editor restored. Originally I was kindof planning to drop it, but obviously it still has a role! It now supports all the modern features that the DopeSheet supports, complete with selection, muting, locking, DopeSheet summary, and all the other tools that you know and love from the other views. Also, this no longer uses the old hacky sliders that 2.4x used (instead it uses RNA-based ones), so should function just the same as other DopeSheet views).