The followings are on my wish list, but most of them might be not realisable, I think:
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Folding and unfolding the code lines like Mathematica notebook and Jupyter notebook. This has been wished many times but not accepted because it needs too much time and effort. However, shortly this feature was supported under Windows. Was the version 3.5.x?
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HyperLinks to a position in an SCD and another SCD.
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Displaying multimedia files like pictures and video in SCD similar to old SC under macOS.
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Changing font, font size and style similar to old SC under macOS.
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Default font which uniformly looks in all OSs.
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Help documentation colours corresponding to the IDE colour themes. It is not precisely the IDE wishlist.
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Indicating code line numbers in the code Mirrors in the help documentation. It is also not precisely the IDE wishlist.