I'm not used to mod ZTS files, but i'll see what i can do.
The problem with ZTS files is that they're more simpler than the BML files and there is a plenty of bytes that i don't know what they mean... so, it's possible that i develop the copy/paste funcionality and corrupts the file...
If you select the "Pack" item, you'll see a "unknow" property at right side. This is a number or a sequence of bytes that exists and i have no idea what they are. They can be the length of the pack or the ID of the string to be used somewhere, i really don't know. So if you copy/paste a pack, what i do with this info? If remain the same, is possible that they simple corrupt the file, or make a double entry and makes the game crash...
I've tried to get the high bytes, the lower, and a various other things to find some useful information to know what this things means, but no sucess. Change only the name was possible without change nothing of this info. So i uploaded here because, after all, is better than change with a HEX editor...
Do you already change this with a hex editor? Know what is this number right before the length of the text means?