[RAND]
[RAND]x,y
This command will cause the macro to wait for a random amount of time before it goes on to the next command. The amount of seconds it waits is y seconds plus a random number between 0 X. For instance:
[rand]30,90
This command will cause the macro to wait between 90 and 120 seconds before doing the next command–a random number of seconds between 0 and 30 plus 90 seconds. You can leave off the second number if you wish.