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Sniffer on moss block
Sniffer will drops spores blossom/Small dripleaf when sniffed on moss blocks.
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Trophy banners
Add some Ominous banner-like banners as trophy. Obtains via boss drops, Shepherd Villager's gifts (Hero of the Village),...
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Sleep without set respawn point
Sneak and right-click a bed to sleep without changing your respawn point.
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Bonemeal Coral fan/block
Coral fans and Coral blocks can be bonemeal (only in warm ocean biome) to grow into coral reef
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Faster copper block oxidation
Copper block and its variations oxidize faster in rain and water.
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Sneaking sweet berry
Sneaking through sweet berry bushes. Wearing pants protects you from sweet berry bush damage.
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Pat your pet
Interact with your pets via shift + right-click (wolf, cat, horse, parrot) to pat them.
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Egg auto hatch after despawn
Chicken eggs on ground will try to hatch after it despawned.
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Explosive sniffer
Right-click powder (gun powder, blaze powder, sugar, redstone, glowstone dust) to Sniffer will make it sniffs and... "To teach kids never to sniff something unknown." - Faewulf
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Usable empty suspicious sand/gravel
You can add items (by shift right-click) into empty suspicious sand and gravel.