Separate keyboard for shortcuts on linux (two keyboards,two layouts)

I have two keyboards: an old ps/2 one and a usb one. I want the usb keyboard to have the us layout (or prefferably have the usb keyboard follow the layout chosen in gnome) and the ps/2 one to have a custom layout (shortcuts and other things :D). I've tried to set seperate layouts on each keyboard at runtime using setxkbmap -device 8 -layout ru (russian layout to test), but this sets the layout on all keyboards to russian.

philippe@tnw:~$ xinput -list
⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ MOSART Semi. Wireless Keyboard & Mouse    id=9    [slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                     id=10   [slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                     id=11   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Power Button                              id=7    [slave  keyboard (3)]
    ↳ MOSART Semi. Wireless Keyboard & Mouse    id=8    [slave  keyboard (3)]
    ↳ Eee PC WMI hotkeys                        id=12   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]

Edit:
Found the part of the answer:
When you specify the layout for a device, you have to include all the layouts you want on all the hardware. So if I want russian on device 2 and US english on 3 then I need to use "ru,us" when specifiying the layout for device 2 and us,ru for device 3. Like this

setxkbmap -device 2 -layout ru,us
setxkbmap -device 3 -layout us,ru

I still need to get this on startup and make a custom layout. Help with that would be much appreciated.

Answer

You need to use

xinput --create-master SecondKeyboard

to create a separate master keyboard, and then reattach the second keyboard to the new master:

xinput --reattach "Keyboard Id" "Master Id"

You use the ids from

xinput --list

This way the keyboards are separate and can be treated exclusively. E.g. you have two focuses, you can write in two applications at the same time with two keyboards, and set different key mappings, by specifying different master ids in things like setxkbmap.