I can't tell you how many times I forget the exact syntax for "FME_SQL_DELIMITER ;" when I'm working with SQLCreator, SQLExecutor, the "SQL To Run Before/After Write" parameters, or anywhere else I enter SQL statements. I have to look it up every time.
I propose a new "SQL Special Expressions" or similar group entry in the left-hand side of the SQL Text editor (see image)
and the very first item on that new group entry would be "FME_SQL_DELIMITER". This would be similar to the Special Characters group entry in most attribute text editors (see image):
There might be other handy SQL-related expressions that could go in this group entry.