Warping system

 I'm trying to keep it not coded if thats possible. :p

Too late lol.

you place a warp, name it

So make a block, and in onBlockActivated method open a guy to the player using,

Minecraft.getInstance.displayGuiScreen(new YourScreen());

You are going to want to open that server side ^^^^.

For the "name it" part you are going to want to add in the GUI a textbox.

Once the players types in the name and clicks "confirm" then add that name as a key to a global list along with the coords.

This will add it to the "world warp list".

Now for the second part,

 go on it, press shift, select a warp

Use the same method "onBlockActivated" but this time check if the player is using shift,

Minecraft.getInstance().gameSettings.keyBindSneak.isKeyDown();

Then open a different gui that shows the list of all of the possible warps. Toggle a warp and go!

For,

the warp waits a bit

Just use a simple timer

private int timer = 60 // 3 Seconds

public void tick()
this.timer -= 1;
if (this.timer <= 0)
{
this.timer = 0;
//DO WHAT YOU WANT HERE
}

Well, keep in mind that the tick method I used as an example. You will need a tile entity for your block for this to work. There is going to be a lot that goes into this block. But if you get any error I'm here (my discord is in my profile).