I don’t know how difficult this would be to implement, but one feature I miss from taking notes (in my Thunderbird drafts) was the free text ability to add "0. " at the beginning of a line (and not have it be converted into a sequenced number).
The reason I would do this was so that I could add items such as “0. Waiting: PR 7 to be merged” to be kept at the top of my quick manually managed to-do list agenda, allowing me to notice it agian and encourage me to check back back on the item, but yet not with the implied urgency of a "1. ", "2. ", etc. item (which I used for action items I can take proactively right now). If these “zero-items” were added automatically to the top of the list, that could work (even being preferable), though noting that I sometimes find adding “00.” or “000.” for sorting even within those zero items to be useful if that would be possible. Of course, as I have time to take a step back, I may move these zero items or other items out of a manually curated list into the formal “On the Agenda” as separate projects, etc., but it is nice to have for these shorter immediate to-do lists that may temporarily expand.