For the speedbuilders, the CPVPers, and generally the entire user-base of Minecraft, I present...

FastPlace!

It is a very powerful mod, which lets you use any right-click function much more easily. You can hold right click to spam placing/using blocks/items.

Latest version available as early-access on Ko-Fi. (Will be available free of charge on 4.20.26)

Keybinds:

O: Opening FastPlace Extras Config
G: Toggling FastPlace
H: Toggling FastHit (still in beta, though you can get early-access on Ko-Fi)

Warning:

You can use this mod to do quite a lot of clutches, but remember:

This mod may be considered cheating in some servers; make sure the server allows the mod before you use it.
USE AT YOUR OWN RISK!

To-Do List:

1. Make a toggle [√]
2. Make a way to customize specifically the item use delay. [√]
3. Finish making the new FastHit feature. [√ (but only as an early-access feature on Ko-Fi)]

5. Made by: Beadu
   I am not responsible for any actions this mod was used for, good or bad as they may be.