The XUTweaker package adds several static utility methods.

Importing the package

Link to importing-the-package

If you want to shorten method calls or encounter any issues you might need to import the package.
You can do so using

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import extrautilities2.Tweaker.XUTweaker;

Allow survival flight

Link to allow-survival-flight

Allows Flight for all players, permanently.

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extrautilities2.Tweaker.XUTweaker.allowSurvivalFlight();

Disable Nether Portals

Link to disable-nether-portals

Prevents Nether portals (and all portals that use the PortalSpawnEvent) from spawning, permanently.

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extrautilities2.Tweaker.XUTweaker.disableNetherPortals();

Check if a player is a fake Player

Link to check-if-a-player-is-a-fake-player

Returns a boolean stating if the player is a fake Player.

Requires an IPlayer argument.

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extrautilities2.Tweaker.XUTweaker.isPlayerFake(player);

Open a books screen for the player

Link to open-a-books-screen-for-the-player

Tries to open the written book screen to the given player.

Returns a boolean stating if the command was executed correctly.
Requires an IPlayer argument.
Also requires a string[] argument that will be the pages.

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extrautilities2.Tweaker.XUTweaker.openBookScreen(player, pages);
extrautilities2.Tweaker.XUTweaker.openBookScreen(player, ["Page 1", "Page 2"]);