Rakelibdir (was: Global rake tasks)

I’ve tried posting on rake-devel, but my message didn’t get through, so
I thought I could ask it here:

I’m trying to use -R (–rakelibdir) option to specify a directory where
my rake scripts containing some admin tasks reside.

Basically these tasks (contained within .rake files) should be available
from everywere, even if there’s no Rakefile in the directory I’m
executing it from.

However (I’m using Windows XP), when I call rake like this:

rake -R=c:\utils\rakes -T

I get following output

rake aborted!
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb,

Is -R option made for this at all? Does it support absolute pathnames? I
looked at the rake source and
Rake::Application#load_rakefile seems to search for the Rakefile first,
and then imports the tasks.