I'm confused

Does the S stand for SCAN and the Blank for SKIP?

the ["",'S",'P'] idiom is embedded in chirp.  It is unfortunate that ["SKIP", "SCAN", 'P SCAN"]  was not used.  In the cases for FT65, FT25 and FT4 if the SCAN/SKIP bit is set SCAN is turned on if clear SKIP is turned on for a given memory slot.

Are other radio the inverse of this, I need to look

Chirp displays an S when the SCAN/SKIP bit is set.

The default in Yaesu SW is SCAN ON

The default in Chirp is SKIP ON.

Swapping {"", 'S'] for ["S", ""] would cause S to indicate SKIP and "" SCAN because of the  ["",'S",'P'] idiom in the memory edit code. 

If I have time I'll take a run at this,  

Fred