I understand the title may be confusing, so let me elaborate further. In a Multiseat derby with at least 2 input devices connected, the camera changes to one that focuses on all 2-4 cars at once. This suggestion is simply to allow this camera to be used in a freeroam with Multiseat enabled, as currently you must keep both cars in frame using one of the default cameras, which is difficult to do.
As roland has mentioned, it does work but I have noticed the more cinematic camera that focusses on both cars can sometimes glitch out and not actually be an available camera view. It seems to glitch when the second player has an input binding to switch vehicles (I think). Resetting both vehicles with CTRL R may fix it but I haven’t used multi seat in a while so not 100% sure.