Your right. ENDCOMMENT is more like a delimiter. Comparable to ENDTEXT, which is also shown as regular text. And comparable to ENDIFF which is ... show as a command.
Go figure.
Well, I agree with Rick. It should be colored like a command. And while you're at it. If you don't mind. I think the lines between COMMENT and ENDCOMMENT should be colored like comment ... meaning, green.
Regards, DJ.