Decimal point vs. comma input: We have a special hybrid problem with the decimal point vs. comma input and wonder whether GuiXT could offer a solution: We use the English keyboard setting in Windows, which implies that the decimal separator key on the numeric part of the keypoard (number pad) enters a decimal point. But we would prefer to have a comma instead.
With GuiXT 2014 Q3 1 and above you can set a special GuiXT option with

ProcessingOption NumPadSeparator=","

which overrules the Windows keyboard setting.