1. You may try to export the survey to TAB separated text, import into EXCEL or OpenOffice.
After your changes import the txt file again.
2. You may try the plugin "massaction", available in LimeStore.
3. If you only want to change the array, which is always the same, you may change the first, and copy it as often as necessary.
Before you delete all "old" array questions, which is done quite easily.
Joffm