What features are actually missing? All of these are small things that could be PRd to the existing GP. Where did you try to request this? I have yet to see this discussed on the GriefPrevention discord.
As for “easier and faster management of claims”, what do you mean? Always interested in usability improvements, but as far as I can see, this GP+ doesn’t do much to alleviate current debatable systems. Opinions are useful to the well-being of a work in progress, but they should actually be formulated.
…and this, “without adding useless calls”, is a matter of opinion. GP is a lot of overhead, but it fits practically every type of use-case, without compromising performance. Besides, useless is a word that does not carry much concrete, or factual basis.