In my race to finish the new AddMe in time for Community-Wishlist-Survey-2023, I overlooked some functionality missing that was in the old AddMe. That is, the concept of "roles", which I guess is really only applicable for endorsing grant projects, but I can make it agnostic so that it can be used for other purposes as well. In particular, it could have an option to be presented as radio buttons instead of a dropdown. The options themselves of course should also be customizable. For example, "support", "neutral" and "oppose", which opens the door for AddMe to be used in places like Requests for Adminship on English Wikipedia.

More info at https://meta.wikimedia.org/wiki/Meta:AddMe#Join_project

This will be needed before the old AddMe can be fully replaced.