Actually, the delegating tasks are already there. I sort of forgot about it until I looked at it again. They don't show up with `rake -T` / `rake --tasks` now, but descriptions could easily be added so that they do.

This could be better though. See the follow-up comment.

    $ rake --tasks --all
    rake build                   # 
    rake bundle                  # Install or update the bundled gems.
    rake clean                   # Remove any temporary products.
    rake clobber                 # Remove any generated file.
    rake default                 # 
    rake full                    # 
    rake public:build            # 
    rake public:clean            # 
    rake run.bat                 # Windows standalone launch script.
    rake support-build:build     # 
    rake support-build:clean     # 
    rake support-client:build    # 
    rake support-client:clean    # 
    rake support-proxy:build     # 
    rake support-proxy:clean     # 
    rake test                    # Run tests
    rake utility:bundler         # Ensure that we're running under Bundler if a Gemfile is present.
    rake web                     # 
    rake windows                 # Install and configure a standalone ruby for Windows.

The dependency graph looks like this:

    $ rake --prereqs
    rake build
        utility:bundler
        public:build
        support-build:build
        support-client:build
        support-proxy:build
    rake clean
        utility:bundler
        public:clean
        support-build:clean
        support-client:clean
        support-proxy:clean
    rake public:build
    rake public:clean
    rake run.bat
        Rakefile
    rake support-build:build
    rake support-build:clean
    rake support-client:build
    rake support-client:clean
    rake support-proxy:build
    rake support-proxy:clean
    rake test
        utility:bundler
        public:test
        support-build:test
        support-client:test
        support-proxy:test
    rake utility:bundler
    rake web
        utility:bundler
        public:web
        support-build:web
        support-client:web
        support-proxy:web
    rake windows
        bundle
        run.bat

(These have been shortened for clarity.)