For a .java file containing more than a single class,

javadoc -private -src *.java

would document all classes, and with src links to all classes. The same file is copied over for all classes (that's fine, the tool cant be expected to split the classes into each physical file, and also it needs to maintain the line nos.)

But if the 'href's are given for each class, the user wont be seeing other classes and searching. the link could directly land in the right class.

I think it is a low-risk and easy fix and is desired for FCS.