externals program, way to do svn:externals-like subproject management without git-submodule

I recently wrote a program called externals to make it more simple for me to manage/deploy subprojects in my ruby on rails apps. The problem was that my projects had a bunch of subprojects, some of which were in svn some in git, and when it came to deploying/managing these subprojects it was kind of a pain in the neck. Also, I wasn't fully satisfied with git-submodule. I'm assuming that several people on this list prefer the git-submodule workflow over svn:externals, but for me, I find myself performing a lot of extra steps that were unnecessary when working with svn:externals. I've found the code I wrote to be really useful so I cleaned it up a bit and released it to the public as the externals project. It provides an SCM agnostic way of managing subprojects with an svn:externals-like workflow.

I posted this on the rails list a week ago (though it can certainly be used in non-rails applications (it does require ruby to be installed, and is best installed via rubygems)) I didn't get any feedback at all which was kind of dissapointing. I decided to mention it here to see if I can get any feedback.

I have a tutorial demonstrating how to use ext here: http://nopugs.com/ext-tutorial

Any feedback is greatly appreciated

Miles