I think it would be very useful if there was a way to sync between two or more instances of a sketchup model. For instance, when designing a house, one should be able to make various copies of the same model and use each one for a different purpose like, one for just modelling, one for setting scene tabs to be exported to layout for working drawings or presentation drawings and another for setting up a walk through animation video. If this can be done one can continue working with the modelling instance and all the models can be synced when changes are made to the actual model without affecting the already set scenes in the other instances.
The scenes i use for my animations are not necessarily the same as what i use drawings, so i have to make different copies for that purpose. But if i make a change in one i have to go back and make the same changes in the other copies.
Maybe there is a better solution to handle this but it would be cool to make changes in one model and know it would be made in other....less time consumption, smaller model sizes due to less scene tabs....just easier to me