First of all, I have to say that the CSV/TSV feature looks lovely. I'm a half-convert from another text-editor, and I only keep it for three features - sorting, copying bookmarked lines and customizable tabs. The third feature (customizable tabs) is definitely done better in EmEditor. There is one problem though: Comma (",") is not used to separate CSV files universally. I know that the "C" in "CSV" stands for comma, but CSVs can be found with ";" instead of ",", especially in countries that use "," as the decimal separator instead of "." that most English-speaking countries use.

In order to be useful for other countries as well, there should exist the possibility to change the list separator. I have the following suggestions:

1. Use the list separator that Windows uses (that is in "HKEY_CURRENT_USER\Control Panel\International\sList", although I'm sure there's a better way than directly reading the registry)
2. Make the list separator customizable (e.g. comma, semicolon, pipe ("|"), space, tab etc.) In this way you can also accommodate more types of files, and simplify the menus a bit.