Hi, yes, I have a kill switch installed and, from experience, it is the best option to disconnect traction control and ABS while going offroad.
Most garages know how to install one, just ask them for a clean install, without wires attahed to fuse legs or similar. My car is going through some check ups, as soon as I get it back I will share a picture.
In the meantime, you can experiment in your next drive by disabling traction the way you do, VDC by pressing the switch next to gear shift and ABS by removing its fuse (car off and preferably no key).