When I go back into a project, it would be useful to be able to go to the end (usually the last frame I worked on), instead of having to scroll through from the beginning.
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Ambient color adjustment
Go to Scene Settings
Press the Color Picker icon under the Ambient Color indicator bar.
I'm not quite sure I understand your request. Currently, when you open a project it does load the scene that was last opened. Can you clarify a bit?