two very random questions

(1) Is there a term or nickname for Gregg users? Greggorians?

(2) I don't understand how the outlines for "maraschino" were contructed in the Simplified and Diamond Jubilee dictionaries. In Simplified, what is that big arc that connects the "ish" to the e-n-o? What's the 2nd vowel in the DJS version, is that /a/ representing schwa as in tuna?