Add an option to choose the display mode of currency symbols (i.e. ISO codes or symbols). I've been using GnuCash for years with multiple currencies and I really prefer to use the ISO names instead of the symbols. I've noted also that, since recent versions, GnuCash favor the use of symbols and, when a symbol is not available for a given currency, the ISO name is printed/shown just to the left of the numeric value without spaces.