I am playing around with the node editor atm. Great tool! Will probably have more than one question :) In order not to spam the forum with threads I'll just post upcoming questions in this one if that's ok. First question would be:

Expand point constant
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Have used nkallen's extension to automatically record the things I click in the UI as node graph - which works nicely.
Initially I was wondering how these generated line nodes know their coordinates - until I found out that there is an "expand point constant" menu entry in the right click menu of the start and end input nodes of a line. Ok!
Now I tried the same with a polyline. Apparently I only get one "Const Point" object though - how is the entire list of points that define this polyline stored? And how can I change these points again?

As soon as I edit some coordinate in that one "Const Point" node that appears after clicking "expant point constant" in the case of a polyline, the auto-generated geometry disappears.
When deleting the "Const Point" node, the polyline reappears. So the initial constants stlll seem to be saved in the polyline (and also line) nodes? (How) could I change these inherent constants?