arrays alone would not really add much except for cleaner code, I suppose.. What I'd like to see along with array support is shift/unshift, push/pop and insert/delete functionality. Preferrably with multi-dimensional support or a way to put arrays into arrays.
Imagine if you were writing an fServe like script, how much cleaner the keeping of the transfer queue would be, for instance.
Also, a foreach statement would be nice, to iterate over all the array elements.
I know it seems a lot, but if this was added, it would really add something more to the language than a little cleaner coding: a LOT cleaner coding