Repeating Attack

We should be able to hold down the attack button with our weapon to make it attack repeatedly so we don't have to click every time.

 

You should just use Wynntils. Based on the technology Wynn is built on, I think implementing this without mods isn't possible.

 

Not everything worth having is worth implementing
Some are better as unofficial mods like Wynntills

 

This is more of a Minecraft limitation, left click inputs normally can't be repeated by just holding down the key
At least in vanilla

 

Minecraft limitation, as said above

 

I wouldn't be opposed to a custom toggle option to swap the left and right mouse triggers for spell-casting, however
Maybe some people might find that more comfortable for non-Archer classes