"I would rather have a shovel as a close range weapon"- okay. Would the hoe be a good long range one? (also I'm not sure if you missed the "spears can be spears or shovels" thing, but I'll fix that soon)
"Hoes should only be up to sharpness V" and "A stronger knockback is something I can agree with" - I mean, I agree with you, I feel like enchantments should be balanced per-weapon, but that doesn't seem to be mojang's style; it seems like if they keep the enchantments, then they want to keep all levels, as it is for sharpness axes. Which is why I was kind of unsure about the stronger knockback.
"Would spears deal more damage when far away?" - No (that was too annoying and even felt unrealistic in Mount & Blade). But, effectively yes, because they deal less damage than a sword at close range, especially if it's over a long amount of time since they attack slowly. I'm not sure if blocking and attacking with a spear would become OP against hoards of mobs, but I don't think so, since running is pretty good too.
"Pickaxes knock enemies upwards?" Yep. Instead of the weapon's knock back knocking the entity away from you, it knocks it straight up, regardless of what direction you are facing. It's good for escape, countering jumping enemies, and slowing enemies by keeping them in the air.