Technically speaking, you _can_ add options like that and they will just [display whatever you label them as](https://github.com/zotero/zotero/blob/4.0/chrome/content/zotero/exportOptions.js#L75), but I honestly don't think that we would want to allow tons of random customizations. For one, they are not going to be localized (if you want them to be localized, you'd need to come up with a good reason to have this option and then add it to Zotero code). And secondly, I don't think that there is any need to have such customization for a CSV export translator, where removing columns/rows of exported data is very trivial.