IT[X]

Forgive me if this has been discussed previously, but I'd like to propose a modification to the IT engine to support rotating variable values. What I mean by this is that if you assign a variable with multiple values, then each time that placeholder is encountered, it will get the "next" value of that variable, until there are no values left, at which point it starts from the beginning of the list. This would allow a very easy mechanism to show tables with alternating row colors for example. Comments?