Punctuation: the gter tsheg

I've been thinking about punctuation lately, namely the gter tsheg. Here are few themes and questions that have come up.

•  Some translators like to include the gter tsheg (i.e., ༔ ) at the end of every line in English. To be honest, I'm not such a fan. The gter tsheg replaces the shad (i.e., ། ) at the end of a line so if we include the gter tsheg to show that a text is a treasure text we should also include the shad other times to show that it is not a treasure text! This is obviously not feasible. Some have put a single gter tsheg at the end of a block of text to show that it is a treasure. This seems to work a lot better. It fulfills the same purpose without so many additional punctuation marks. In fact, it's a lot like jewelry (rgyan cha). A single thin gold necklace looks far more attractive than fifty chunky chains of iced gold. Indeed, sometimes less is more. I wonder if we couldn't invent a treasure period mark? My understanding is that the gter tsheg was developed not so much from the process of the revelation of the treasure but from the process of writing it down. So how would it look like if we made an English version? I have no idea. Maybe something like the Chinese period mark (。). Or maybe not!
   
• I wonder why the gter tsheg is actually not called a gter shad since it replaces the shad and not the tsheg? Perhaps because structurally it resembles more a dot than a bar?
  
• Now where does the gter tsheg come from? That is a very good question that I do not know the answer to. It might be interesting to note that there is a double tsheg found in Dunhuang manuscripts. Sam van Schaik notes how the double tsheg fell out of usage after the Imperial Period. Perhaps it was revived albeit in a modified form with the rise the terma tradition? Van Schaik has more on the different from of tshegs here: https://readingtibetan.wordpress.com/resources/punctuation/
  
• From the Rangjung Yeshe Dictionary:

Terma sign, according to the vision of Taksham Dorje, it is said that the two circles symbolize means and knowledge and the crescent moon their indivisible unity. This is, however, not totally fixed since the wood blocks at Mindroling have only two circles without a crescent moon.

If you have any info or resources on this please do share! Here is a beautiful piece of calligraphy by Tashi Mannox featuring the gter tsheg which I do not own the rights to.