I just know one possible answer:
> 2. How to use tracker 'action' options? What does it do, is there any docs on this topic?
In french, search through here:
English translation (very low % done, afaik):
(I guess this information of the English site should be moved to doc.tw.o - however this is just a guess, I wonder why nodoby moved that before, after a year this English info about trackers (Forms) is there....)