When creating animations, users are restricted to having a uniform length of time between transitioning from one scene to the next. The same is true for the delay between each scene. There may be other users who would like to have the capability to introduce variable delays and transition times in their SketchUp animations where transition duration might start at 3 seconds and gradually decrease in subsequent scenes to say a half second or the delay between scenes may begin at 1 sec and eventually stretch to 5, for example. This may favorably impact the dramatic effects that could be produced in model animations.
This capability may be present in an extension already, although I am not aware of this, but I think having this feature available as part of SU’s native tool set would be a desirable modification.