We have the option of selecting the Ctrl, Alt or Shift checkbox and choosing a key from the list. To the right of this this field is an additional checkbox labelled "Extended". What effect does ticking this box have? By the way: In addition to Ctrl, Alt and Shift, it would be useful to be able to select the Windows key as well.
It seems that this error is still not corrected. That is a pity. I could use this program very much. (OS: Win10 Pro, 64-bit)