It'd be great to allow workflow updates/bug fixes through some kind of built-in update system. It should check a repository master branch for new commits (on GitHub for example), and pull if there's any - or at least give the user the option to.
Currently you have to keep an eye on every workflow developers' blog/twitter account to get notified about updates.
An app that does something like this is Sublime Text 2's unofficial package manager called "Package Control".