What does the "VimTouch Full Runtime" do? I just installed VimTouch; it works as well as you expect a text editor to work on a phone. What is the point of the separate "VimTouch Full Runtime" app?
From browsing the source code, this appears to be the same as the vim-runtime package as provided in most Linux distributions. It ships a variety of Vim scripts which provide additional functionality, such as additional color schemes, file type handling, automatic indentation, etc.

Without this package, Vim operates in a minimal mode and many features that are provided by these scripts are not available.