scaladoc -help
gives:
Usage: scaladoc <options> <source files>
where possible scaladoc options include:
-diagrams Create inheritance diagrams for classes, traits and packages.
-diagrams-dot-path <path> The path to the dot executable used to generate the inheritance diagrams. Eg: /usr/bin/dot
-diagrams-dot-restart <n> The number of times to restart a malfunctioning dot process before disabling diagrams (default: 5)
-diagrams-dot-timeout <n> The timeout before the graphviz dot util is forcefully closed, in seconds (default: 10)
-diagrams-max-classes <n> The maximum number of superclasses or subclasses to show in a diagram
-diagrams-max-implicits <n> The maximum number of implicitly converted classes to show in a diagram
-doc-footer <footer> A footer on every ScalaDoc page, by default the EPFL/Typesafe copyright notice. Can be overridden with a custom footer.
-doc-format:<format> Selects in which format documentation is rendered (html) default:html
-doc-generator <class-name> The fully qualified name of a doclet class, which will be used to generate the documentation
-doc-no-compile <path> A directory containing sources which should be parsed, no more (e.g. AnyRef.scala)
-doc-root-content <path> The file from which the root package documentation should be imported.
-doc-source-url <url> A URL pattern used to build links to template sources; use variables, for example: ?{TPL_NAME} ('Seq'), ?{TPL_OWNER} ('scala.collection'), ?{FILE_PATH} ('scala/collection/Seq')
-doc-title <title> The overall name of the Scaladoc site
-doc-version <version> An optional version number, to be appended to the title
-expand-all-types Expand all type aliases and abstract types into full template pages. (locally this can be done with the @template annotation)
-groups Group similar functions together (based on the @group annotation)
-implicits Document members inherited by implicit conversions.
-implicits-hide:<implicit(s)> Hide the members inherited by the given comma separated, fully qualified implicit conversions. Add dot (.) to include default conversions.
-implicits-show-all Show members inherited by implicit conversions that are impossible in the default scope. (for example conversions that require Numeric[String] to be in scope)
-no-link-warnings Avoid warnings for ambiguous and incorrect links.
-no-prefixes Prevents generating prefixes in types, possibly creating ambiguous references, but significantly speeding up scaladoc.
-raw-output For each html file, create another .html.raw file containing only the text. (can be used for quickly diffing two scaladoc outputs)
-skip-packages <<package1>:...:<packageN>> A colon-delimited list of fully qualified package names that will be skipped from scaladoc.
Additional debug settings:
-diagrams-debug Show debugging information for the diagram creation process.
-implicits-debug Show debugging information for members inherited by implicit conversions.
Standard scalac options also available:
-Dproperty=value Pass -Dproperty=value directly to the runtime system.
-J<flag> Pass <flag> directly to the runtime system.
-P:<plugin>:<opt> Pass an option to a plugin
-X Print a synopsis of advanced options.
-bootclasspath <path> Override location of bootstrap class files.
-classpath <path> Specify where to find user class files.
-d <directory|jar> destination for generated classfiles.
-dependencyfile <file> Set dependency tracking file.
-deprecation Emit warning and location for usages of deprecated APIs.
-doc-external-doc:<external-doc> comma-separated list of classpath_entry_path#doc_URL pairs describing external dependencies.
-encoding <encoding> Specify character encoding used by source files.
-explaintypes Explain type errors in more detail.
-extdirs <path> Override location of installed extensions.
-external-urls:<externalUrl(s)> (deprecated) comma-separated list of package_names=doc_URL for external dependencies, where package names are ':'-separated
-feature Emit warning and location for usages of features that should be imported explicitly.
-g:<level> Set level of generated debugging info. (none,source,line,vars,notailcalls) default:vars
-help Print a synopsis of standard options
-implicits-sound-shadowing Use a sound implicit shadowing calculation. Note: this interacts badly with usecases, so only use it if you haven't defined usecase for implicitly inherited members.
-javabootclasspath <path> Override java boot classpath.
-javaextdirs <path> Override java extdirs classpath.
-language:<feature> Enable one or more language features.
-no-specialization Ignore @specialize annotations.
-nobootcp Do not use the boot classpath for the scala jars.
-nowarn Generate no warnings.
-optimise Generates faster bytecode by applying optimisations to the program
-print Print program with Scala-specific features removed.
-sourcepath <path> Specify location(s) of source files.
-target:<target> Target platform for object files. All JVM 1.5 targets are deprecated. (jvm-1.5,jvm-1.5-fjbg,jvm-1.5-asm,jvm-1.6,jvm-1.7,msil) default:jvm-1.6
-toolcp <path> Add to the runner classpath.
-unchecked Enable additional warnings where generated code depends on assumptions.
-uniqid Uniquely tag all identifiers in debugging output.
-usejavacp Utilize the java.class.path in classpath resolution.
-verbose Output messages about what the compiler is doing.
-version Print product version and exit.
@<file> A text file containing compiler arguments (options and source files)
Deprecated settings:
-make:<policy> Recompilation detection policy (all,changed,immediate,transitive,transitivenocp) default:all
deprecated: this option is unmaintained. Use sbt or an IDE for selective recompilation.
Beside from that I don't know of any other information sites. The only thing available for sure is the source code that contains all settings.