-Make explosion particles match Legacy Console
-Add a legacy console combat mode option. Basically completely gets rid of cooldown, removes sword sweeping attack (only be obtainable if you add sweeping edge enchantment) and match the tools/weapons and trident damage values to Legacy Console, and have netherite tools/weapons only 1+ damage more than diamond tools/weapons.
-Match the creative mode flying. Either optional, or just have it in the game.
-Make it compatible with essential mod
-Ability to select resource packs for specific worlds
-Legacy Console Edition fog

To add onto your suggestion, I'd love to see this mod for older java versions like 1.7.10 or 1.12.2. The legacy UI has got to be the most convenient UI in a game (in my opinion) ever. I'd also love to see a way to swap between crafting menu and inventory menu (like a keybind, or something) to toggle which GUI you're in, just for convenience.

Also limited world sizes as well as a skin selector like in console would be nice