How to set the default controller device per core in retroarch?

[candre23]

I'm using retroarch on windows with an xbox one controller and wireless dongle.  The controller is recognized and works fine for most systems, but others need the controller device specified manually, or no inputs are recognized.  For example, sega saturn (beetle saturn) requires that the controller device be set to "control pad", and wii (dolphin) requires "wiimote + classic gamepad".  In retroarch itself, the device is set to "retropad", which works for most cores but not a few picky ones.  If I pull up the retroarch menu and choose the correct device, it works fine fine - but it doesn't save that setting and needs to be manually changed from the retroarch menus every time a game from that platform is launched.

What I need it a way to specify "for all wii games, set the controller device to wiimote + classic gamepad".  You would think this would be in dolphin-emu.opt in the config directory, but it isn't.  Where can I add this configuration?

[Headrush69]

In the controls section of Retroarch's quick menu, save a core remap, a content directory remap or a game remap and it should be set ever load.

You probably want a core remap unless you have a core that runs multiple systems, which you'll probably want content directory remap for that one.