navigating frames for longer animations and multiple characters sucks. It would be nice to have the actual frame system optimized to a cleaner and easily usable UI and features. 

My biggest issue is there's no "master" frame. A category for each character and prop that will edit all bones and such underneath it. I can't tell you how many times I've had to restart an animation because of the 50+ bones I've had to navigate just to find the culprit.

Ex:  Master Character > Body/Arm/Leg

Instead of needing to edit each key frame for each part of the character, click on the Master Character key frame and adjust the character accordingly, which will in turn edit the Body/Arm/Leg keyframes of that Character on that frame.