Armor stand locking: pretty simple idea, basically you could shift-click an armor stand base with a netherite scrap to lock interaction and make it invincible. the base could be shift-clicked again to remove this functionality
Amethyst/corundum and redstone tuning: Using an amethyst crystal in the redstone randomizer would provide a 75/25% weighting of outputs, and using corundum would be 90/10% chances.
Projectile stasis: some sort of block which a projectile could be put in and then released from when it receives a signal, would be useful for pearl stasis or some redstone traps/mechanisms scrapped due to discord feedback, too op. replacement maybe coming soon
Maybe holding milk in your offhand makes negative effects you recieve 30% shorter? This of course comes at the cost of not using your offhand for something else. scrapped due to discord feedback, due to being mostly useless.
I'm not 100% sure that these ideas are truly vanilla plus, but they don't seem too extreme