What is the process for either requesting an update to the format of a merge field or requesting that a new field be created?

In the US, the proper format for an address is: 

City, State Zip 

What OPEN kicks out is:

City State Zip (no comma)

Since I suspect that this is set up to be common format in Australia, is it possible to create four new merge fields for street address, city, state and zip so we can format addresses properly for here in the US?

Thanks, Alan