Based on recent threads, I've added two tasks to our 2021 GSoC ideas page:
https://wiki.list.org/DEV/Google%20Summer%20of%20Code%202021#List_Configurat... https://wiki.list.org/DEV/Google%20Summer%20of%20Code%202021#User_Profile_To...
Bcc'd to David and Johannes because I referred to threads starting with their posts. If you want me to paraphrase in the task description, let me know, but I preferred to do it this way to encourage applicants to join the community. (Note: we haven't been selected yet, so this isn't any more public than the archived mailing lists.)
Suggestions of other GSoC tasks and refinements to existing ones welcome. However, please discuss them on the list (or to a core dev privately) unless you have GSoC experience. Google has specific requirements for Summer of Code projects, so there are a lot of important tasks that should not be on that page.
If you have an enhancement that you'd definitely like to put on our agenda, and also suggest for GSoC, feel free to file an issue on the tracker and point me, Mark, or Abhilash to it.
Steve