I would really like that feature. Afaik you have to delete your custom lists atm to change their order.
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This is the feature I want most for my list. A custom order option (and the ability to make that order default)
You could drag and drop entries (like letterbox'd lists if you are familiar) or use little arrows to push titles up and down... I don't care how tedious it would be, I would be clicking away all day.
I would mostly keep it alphabetical but it drives me insane that "The" is alphabetized, so I can use that function to override that.
I would also move sequels that aren't alphabetically next like any of them starting in Zoku to follow the parent series. Or a franchise with a lot of series (like fate) I can reorganize that group into either release order OR chronological order, rather than just alphabetical.
I'm sure others would get really into the feature and sort from favorite to least favorite, or by genre, there are a lot of possibilities.
In my opinion is better to order by release date.
So you can sort by release date when view your's or another's list, you just can't set it as your default.
I will argue that if there was at least a a custom default order a dedicated person could reorganize it into release order.
While that is a hassle and honestly, I would think a default release order shouldn't be too hard too implement as it is a possible sorting order already