We have a script file that allows you to dynamically build an array of a given size up to around 250 elements. It also allows you to prefill the elements with a value so you can create Boolean, number or pose arrays.
We used a JavaScript program to create the file. It’s a silly workaround but it works and it doesn’t add much overhead to the program. You can find the script file in the thread mentioned above.
We also have the ability to return an array via XMLRPC.