In truth, I'm sure there is no point in implementing any form of multi-line comments (based on the methods that most parsers use to read / execute a script). In my personal opinion, scripts require multi-line comments most of all because of distribution and explanation (most high-level languages are usually compiled, and only a percentage of it is open anyway). I know that Lua, a scripting language, provides multi-line comments:
COMMENT
]==]
I am sure that it is just a coincidence that many languages do not support this. It is generally accepted to simply use single comments to create a multi-line comment.
//*****************************************\\
//** **\\
//** JOHN SMITH **\\
//** COPYRIGHT 2008-2011 **\\
//** **\\
//*****************************************\\
(ASCII ART) ( , , // /).