Ended Jan 31, 2016
THIS IS A OLD POST
GO AWAY OR LOOK AT THE NEW VERSION OVER HERE http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-tools/2620778-minecraft-portable-version-1-1-1
I got what you meant but you also have to install the runtime when you want to run it from somewhere else or use java.
This "portable" version was made for computers that dont have appdata access / java. And copying the .minecraft folder is a pain in the ass if it is 5 GB big.
and it is faster then this batch file if you just want to play on a world etc. but the batch is 100% customizable so you can mess with the way it saves things (runtime .minecraft etc.)