It says to put scripts in scripts. (Which doesn't exist)
The who, the what, the where now?
Will there be a way to pack stuff in a way so that downloaders won't need the engine?
I'm not sure what you mean... Do you want every download to contain a copy of the engine so it's self-contained, or do you not want to add the engine to reduce download size. Both are possible, and the default is to always include a copy of the engine (the engine is under 3MB compressed).
How do i run this in mac?
Edit :
java -jar Danmakutime.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
Run the "run-mac64.sh" shell script. The error message means your Java version is too old to run the code, you need to upgrade to Java 6.