[TRACKER] Movie Maker mode issues

This is a tracker for issues related to [Movie Maker mode](https://docs.godotengine.org/en/latest/tutorials/animation/creating_movies.html).

### Bugs

- [ ] https://github.com/godotengine/godot/issues/52821
- [x] https://github.com/godotengine/godot/issues/69965
- [x] https://github.com/godotengine/godot/issues/71254
- [ ] https://github.com/godotengine/godot/issues/76625
- [ ] https://github.com/godotengine/godot/issues/79221
- [ ] https://github.com/godotengine/godot/issues/98033

### Enhancements

- [x] https://github.com/godotengine/godot-proposals/issues/4730
- [ ] https://github.com/godotengine/godot-proposals/issues/4751
- [ ] https://github.com/godotengine/godot-proposals/issues/4752
- [ ] https://github.com/godotengine/godot-proposals/issues/5387
- [ ] https://github.com/godotengine/godot-proposals/issues/5790
- [x] https://github.com/godotengine/godot-proposals/issues/5809
- [ ] https://github.com/godotengine/godot-proposals/issues/5989
- [ ] https://github.com/godotengine/godot-proposals/issues/6041
- [ ] https://github.com/godotengine/godot-proposals/issues/6390
- [x] https://github.com/godotengine/godot-proposals/issues/6409
- [ ] https://github.com/godotengine/godot-proposals/issues/6698
- [x] https://github.com/godotengine/godot-proposals/issues/7594
- [ ] https://github.com/godotengine/godot-proposals/issues/10505
- [x] https://github.com/godotengine/godot-proposals/issues/11541

### Pull requests

- [ ] https://github.com/godotengine/godot/pull/75148
- [ ] https://github.com/godotengine/godot-proposals/issues/3726

Review the linked bug and proposal issues to understand which Movie Maker mode items remain unresolved. There is no implementation file or test named here; done would require addressing or coordinating the outstanding linked items and updating this tracker checklist.

Written by the indexing model from the issue text.