User + Pass for SVN authentication?

Would it be possible to add support for SVN authentication? Even though we'd end up with the password stored in cleartext for our internal-use-only makefile, we'd be using a read-only account, which is a huge step up from allowing anonymous access to our repo. Repo's not stored on our network- we're using a hosted service, so it'd be much easier to customize this aspect of drush make (checking to see if [user] + [pass] are set for [project][download] and, if so, using them) than make other changes to our setup. Seems like we can't be the only ones who would have this use case.