AHK: remap numeric keypad with Numlock On so it behaves like numeric keypad with Numlock Off - autohotkey

Question

I'd like to remap the numeric keypad with Numlock On to behave like the numeric keypad with Numlock Off, including being able to extend the selection with Shift/Ctrl held down.
The problem I have is the following
Numpad8::Up
Doesn't have correct behaviour when shift+numpad8 is pressed, the cursor moves up, but no text is selected. The following also don't work as I'd like (same behaviour as Numpad::8).
+Numpad8::Up
+Numpad8::+Up
If I remap a normal key, the selection behaviour is correct when shift is pressed:
w::Up
Any hints?
The reason I'm doing this is to make a CoolerMaster QuickFire TK's numeric keypad behave like it has a standard numeric keypad layout (I've some registry keyboard remapping happening as well, which is why I want the navigation behaviour with Numlock On).

Answer 1

It's possible, but it's a pain in the ass... compared to normal remapping.
Here is the normal behaviour of the Numpad8-key:
With numpad on:
num8: up
shift+num8: mark up
With numpad off:
num8: 8
shift+num8:up
So if you want to reverse that, what we want is this:
With numpad on:
num8: 8
shift+num8:up
With numpad off:
num8: up
shift+num8: mark up
This is how it could be achived:
*NumpadUp::
If GetKeyState("NumLock", "T")
SendInput, {Shift Down}{Up}
Else If GetKeyState("Shift")
SendInput, {Shift Up}{NumpadUp}
Else
SendInput, {Shift Up}{Numpad8}
Return
*Numpad8::
If GetKeyState("Shift")
SendInput, {Shift Down}{NumpadUp}
Else
SendInput, {NumpadUp}
Return
Now you just need to do the same thing for the other numpad keys that you want to reverse.

Answer 2

Here is a different approach that uses a little hack to make it look like the Numpad toggles when pressing the numlock key. But it ensures that the numlock actually is always off and only the numlock light is changed.
SetNumLockState, Off
fakeNumlockOn := False
Return
NumLock::
SetNumLockState, Off
fakeNumlockOn := !fakeNumlockOn
SetNumLockLEDs(fakeNumlockOn ? "on" : "off")
Sleep, 100
SetNumLockLEDs(fakeNumlockOn ? "on" : "off")
Return
SetNumLockLEDs(state) {
Loop, 11
KeyboardLED(2,state,A_Index-1)
}
/*
Keyboard LED control for AutoHotkey_L
http://www.autohotkey.com/forum/viewtopic.php?p=468000#468000
KeyboardLED(LEDvalue, "Cmd", Kbd)
LEDvalue - ScrollLock=1, NumLock=2, CapsLock=4
Cmd - on/off/switch
Kbd - index of keyboard (probably 0 or 2)
*/
KeyboardLED(LEDvalue, Cmd, Kbd=0) {
SetUnicodeStr(fn,"\Device\KeyBoardClass" Kbd)
h_device := NtCreateFile(fn,0+0x00000100+0x00000080+0x00100000,1,1,0x00000040+0x00000020,0)
If (Cmd = "switch") ;switches every LED according to LEDvalue
KeyLED:= LEDvalue
If (Cmd = "on") ;forces all choosen LED's to ON (LEDvalue= 0 ->LED's according to keystate)
KeyLED:= LEDvalue | (GetKeyState("ScrollLock", "T") + 2*GetKeyState("NumLock", "T") + 4*GetKeyState("CapsLock", "T"))
If (Cmd = "off") { ;forces all choosen LED's to OFF (LEDvalue= 0 ->LED's according to keystate)
LEDvalue := LEDvalue ^ 7
KeyLED := LEDvalue & (GetKeyState("ScrollLock", "T") + 2*GetKeyState("NumLock", "T") + 4*GetKeyState("CapsLock", "T"))
}
success := DllCall( "DeviceIoControl" , "ptr", h_device , "uint", CTL_CODE( 0x0000000b , 2 , 0 , 0 ) , "int*", KeyLED << 16 , "uint", 4 , "ptr", 0 , "uint", 0 , "ptr*", output_actual , "ptr", 0 )
NtCloseFile(h_device)
return success
}
CTL_CODE( p_device_type, p_function, p_method, p_access ) {
return, ( p_device_type << 16 ) | ( p_access << 14 ) | ( p_function << 2 ) | p_method
}
NtCreateFile(ByRef wfilename,desiredaccess,sharemode,createdist,flags,fattribs) {
VarSetCapacity(objattrib,6*A_PtrSize,0)
VarSetCapacity(io,2*A_PtrSize,0)
VarSetCapacity(pus,2*A_PtrSize)
DllCall("ntdll\RtlInitUnicodeString","ptr",&pus,"ptr",&wfilename)
NumPut(6*A_PtrSize,objattrib,0)
NumPut(&pus,objattrib,2*A_PtrSize)
status:=DllCall("ntdll\ZwCreateFile","ptr*",fh,"UInt",desiredaccess,"ptr",&objattrib ,"ptr",&io,"ptr",0,"UInt",fattribs,"UInt",sharemode,"UInt",createdist ,"UInt",flags,"ptr",0,"UInt",0, "UInt")
return % fh
}
NtCloseFile(handle) {
return DllCall("ntdll\ZwClose","ptr",handle)
}
SetUnicodeStr(ByRef out, str_) {
VarSetCapacity(out,2*StrPut(str_,"utf-16"))
StrPut(str_,&out,"utf-16")
}