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I have a bench power supply which takes this further by having two stop-less potentiometers on the same shaft with a 180-degree offset to cover the gap. It works quite well!

When I wrote that I assumed it was a physical possibility but I didn't realize people actually did that.

It would actually probably work pretty well for a Pong system, since the discontinuity would be when the paddle was off-screen. But I don't know if any system actually did that.

I'm pretty sure I've used that 2465, and I don't remember any of those pots not having a stop.

The cursor knobs are full turn. The service manual goes into some depth explaining how they work. If you play around you can find the gap where the cursors become non-responsive but in typical usage you skip over it and don't notice because the firmware is tracking the velocity and keeps them moving when the wiper is disconnected.