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The camera time profile should not use: " whatever the frame number the longest layer ends on, is going to be the total profile time"

this behaviour often becomes very confusing.
for instance: if you switch to "display the current layer", suddenly this layers last frame becomes the profile time endpoint and the camera move is thrown completely off, into a new timing

or if, while animating, you are adding frames a cam move will start to change its position.
i think it should always use the mark in and mark out as its begin and end point.

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I understand this behavior is not very comfortable. Actually, I think the solution should be linking the camera move to the mark out point (if no mark out = longest layer, just like now).

It would also allow to place camera moves, even if the layer gets only 1 instance of 1 frame.

But I remember it was technically impossible in 2011. Maybe now it may be possible, since the structure of the timeline changed with TVPaint 11.