Documentation says lamps turn on from right clicking with an empty hand.
Reality is that you shift+rightclick with an empty hand.

Please align the two.

This issue is either very old or invalid

Unless it specifies to not shift-right-click somewhere else

This issue is either very old or invalid

Wrong, neither. It appears right now in the 1.10.2 branch at a minimum:

https://github.com/Ellpeck/ActuallyAdditions/blob/1.10.2/src/main/resources/assets/actuallyadditions/lang/en_US.lang#L776

<n>When <imp>right-clicking<r> them with an empty hand, they will <imp>turn on and off<r>.

So, very old