The dialog for exporting a result offers the encoding, but it always defaults to ANSI. I guess most users need always the same encoding. So it would be nice if Heidi keeps the selection in the settings.
And it would be nice to have an "UTF8 with BOM" which makes it easier to open it in Excel.
And while I am at it: A warning if the first column is named "ID" would be nice, because this can lead to strange results in Excel.