Use "VT220" Keyboard Mapping

disable key codes extended with modifier (alt,shift,ctrl) according to the flags set via allow systematic modifier reporting in legacy and vt220 mode and select format for modifier keys in other key press reports.
delete by default sends an escape sequence
remaps numpad '+' to numpad ','
remaps ctrl - numpad ',' to numpad '-' (including from ctrl - numpad '+')
remaps editing keys in the numpad to their numeric meanings (even with numlock off)
Ctrl + f-keys transposes the number of the f-key up by 10.
Shift + f-keys (and a few others) is used for user defined keys (see dec user defined keys).

Terminal Guide