in most cases in Hebrew, the trop can positioned nicely by simply creating a mark to mark.
So here I have created for the segol, an anchor called nikud
So now, all the trop usually sits correctly.
without having to work too hard 
now, I have an interesting situation with the letter qof where there isn’t enough space for the trop so I have creating a pos in the mark feature using the mark filtering set to take into account the dagesh (aren’t you proud):
lookupflag UseMarkFilteringSet [@wide @lowertrop];
pos qof @wide' @lowertrop <50 0 0 0>;
which works kinda:
I then thought right, I will move the etnachta down and write code like this:
lookupflag UseMarkFilteringSet [@wide @lowertrop];
pos qof @wide' @lowertrop <30 0 0 0>;
pos qof @wide @lowertrop <-20 -90 0 0>;
to achieve what I want but the etnachta-hb didn’t move down. It occurred to me that of course it won’t because there is an anchor on the segol forcing the etnachta-hb to stick to the left of the segol.
I know I can accomplish this with glyph composition by creating a segol-etnachta-hb combination, but I would really like to try an achieve this with contextual mark positioning.
So since the etnachta-hb is actually anchored to the mark segol, then I need to do the * trick on the segol mark correct?
However, of course I am doing it wrong 
I created a 2nd anchor (on the segol mark) called @nikud_qof and in the Anchor Context typed:
lookupflag UseMarkFilteringSet [@wide @lowertrop]; qof @wide *
that of course didn’t work. So I thought, hang on, I am just targeting the etnachta if the *nikud_qof anchor comes after a qof so I tried:
lookupflag UseMarkFilteringSet [etnachta-hb]; qof *
Is what I am trying to do even possible when it’s mark-to-mark?
If not, am I best of creating a new glyph with a segol and etnachta combined as one and then use the calt feature to substitute? Or perhaps there is a lookup flag to ignore the anchor of the etnachta-hb?
