GUISettings.cursorFlashSpeed
var cursorFlashSpeed: float;
Description

The speed of text field cursor flashes.

This is how many flashes / second. If you set it to 0, flashing will be disabled. If you set it to -1, the flashing speed will match the system default of the end user.
	var str : String = "This is a string with \n two lines of text";
	
	function OnGUI() { 
		GUI.skin.settings.cursorFlashSpeed = 3;
		str = GUILayout.TextArea(str);
	}