[GameCube] Setting mouse for Analog or C-Stick ?

[inukaze]

Hi there, i am user of GNU/Linux ( Slackware64 14.2 ), i had download and compile Dolphin 5.0 from Git using a SlackBuild.

The Dolphin-Emu works really fine with games. but with some titles like
Luigi Mansion
Geist
Metroid Prime

For example if i want to set the mouse for C-Stick or Main Analog Stick. the mouse sensivity is really slow
i can mouse multiples time to up, until dolphin make the first move to up came from the mouse.

i had set in C-Stick for example for Geist :

-----------------------------------------------------------------------------
UP -> `Cursor Y+` | `XInput2//Virtual core pointer:Axis Y+`
DOWN -> `Cursor Y-` | `XInput2//Virtual core pointer:Axis Y-`
LEFT -> ``Cursor X-` | `XInput2//Virtual core pointer:Axis X-``
RIGHT -> `Cursor X+` | `XInput2//Virtual core pointer:Axis X+`
-----------------------------------------------------------------------------
Z -> J | `Click 1`

Where & How i can specify the mouse sensitivy for specific title ?

i try to find some information on internet, but all tutoriales are just for Wii Emulation, never for GameCube.

Dunnos :

Why in the terminal i see this message :
(dolphin-emu:23189): IBUS-WARNING **: Unable to connect to ibus: No se pudo conectar: Conexión rehusada


What do the option :
Background Input ( Well i think this is for receive the command when the game window is not focused )
Modifier ( someone can give me an example of real use? )
Iterative Input ( someone can give me an example of real use? )

Which devices is better to use in X.Org ?
" Xlib/0/Keyboard Mouse " or " XInput2//Virtual core pointer "