Considering detours on a couple of topics I've had on the list for a long time that 3 reminds me of. Specifically related to (1) implicits and (2) block structure syntax.
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Re. implicits, it might also be interesting to look into Agda's instance arguments, and the fork of OCaml that implements the modular implicits proposal. Along with the paper, I think there are a few blog posts floating around on the things those might let you do.
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Would be interesting to compare the instance resolution algorithms - apparently Scala's instance resolution has subtleties that can make things confusing - ie. you are not sure what instance is being used, which Modular Implicits were intending to improve on.
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Not sure how Agda's instance arguments compare on that front though. 🤔 agda.readthedocs.io/en/latest/lang