UberSelection is heavily inspired (read: rip-off) in vi's ex mode, but it just implements a handful of standard commands (and some of them are broken IIRC). The interesting ones --to me, at least-- resemble ex commands, but they don't even share the same syntax --save for the ranges (.,$, etc).
The installation instructions are wrong because they include information valid for ST1 only... It should be a matter of dropping the .sublime-package file inside your Installed Packages folder (a sibling of Packages, which is accessible via Preferences from the main menu).
In any case, I believe bookmarks should work in this case, and they are far simpler to use.