I've been looking to adopt dotfiles for my configurations, and have sadly found that the vim configuration is rather opinionated and to undo those views I have to unmap and then remap a whole host of keys mappings.
In particular, the author has taken the opinion that <space> should be the leader rather than the default (\). To remap this, one must make quite a few changes.
I'd suggest that some way to select your own leader be provided - perhaps a .vimleader file, or similar.