This looks really useful! Now servers can give players the option to build their bases creatively. Would it be possible to enable flight while holding these creatively specified blocks? This would let players truly build in creative (not sure how difficult it would be to code though). That also could be abused, but it's the fist thing that came to mind.
Would it be possible to either release an alternate version or a version with a config option that does NOT allow the blocks to be destroyed in one hit? I love this mod as it lets me build cool things without totally ruining survival, but I've accidentally destroyed blocks soooo often with it that it's becoming a nuisance. I feel like my mighty mage tower is super fragile and don't even want to let other players near it since it's such a pain to go dig up the blocks used to build it from whatever chest they're stashed in to repair accidental damage.
(Also it's a huge pain to have a fight near these blocks as everything is just destroyed right away.)