The default funs
argument will find all functions not mentioned in flat-format ready-for-doc2Rd documentation. This is useful for documenting a group of "internal" functions.
make.usage.section
simply puts the name of each function before its deparsed and concatenated argument list, one function per line.
make.arguments.section
puts one argument per line, then a colon, then the name of the function in parentheses. The idea is that something about the argument should be added manually in a text editor.