Something I've wanted is more customizable upgrade logic for selecting versions, especially upgrades for end-user packages. e.g. latest tagged release (without

Something I've wanted is more customizable upgrade logic for selecting versions, especially upgrades for end-user packages. e.g. latest tagged release (without having to update the package/flake), latest tagged release but wait a week/month (like phased releases but end-user configurable), HEAD but no more than once a week (so you aren't compiling packages every day, c.f. emacs), whatever the latest version is provided it is in cachix, etc