When trying to lipsync in Synfig I aggressively tried to figure out ways to make it even easier. What we currently “lack” is to recognize what several waypoints contain at a given glance, especially when you need to recognize whether a waypoint contains an “O”, or “Um”, or “Aye”.
I have a feature proposal: How about the ability to label Waypoints to recognize them at a glance without scrubbing the timeline? A small, distinctive “quote” containing a letter or a word?
Another proposal: What about the ability to group Waypoints into “sets”, so as to be able to modify or duplicate or delete animations as one recognizable element? This can usually be used for “lightbulb idea” animations, or perhaps special effects like “Bump!”, “Flash” or sort.