Chucky, what is your problem with it? Do You use it as a tool?
It is an improvment of built-in magnet tool, lm_magnet.lua, so you have to put it into tools folder, adding built-in icons and cursor to it (rename all the files the same way).

Wow! It was very, very useful!!
Now it seems to me the script can work with rotated layers.
New version is here: ae_magnet.lua
(Now it's on my own host, not yandex)

Synthsin75, thank You very much for testing. My supposition about camera matrix was wrong. And I found a very strange thing: vec2:Set(vec1) some_matrix:Transform(vec2) some_matrix:Invert() some_matrix:Transform(vec2) It seems to me, vec2 must be equal to vec1 after these operations. But it does not....

I suppose the problem with GetFullTransform() was that it considers camera transformation. After multiplication with inverted camera matrix it realy allows to get point positions to match across layers.
Please try my version of multilayer-magnet:
https://yadi.sk/d/zhWmkgtW3JnDz7

Does it mean no way to sync channel with original? No place this data stored in?

Is it possible to execute the subj. command with LUA?
(It is about the right mouse button option, clicking on reference layer's timeline channel)