T Install Maker is a program designed to automate the NSIS script. It works with its own internal language and is quite complex. T Install Maker is recommanded for big projects or useless projects.
The program allows you to create global hotkeys for iTunes
First off, please note that there are 3 modules not included in the .exe so I compiled these to a .zip to make for a quicker download. Extract the .zip and keep all files together. It's pretty self-explanatory. Run the .exe, on first run you are forced to put in new hotkeys. You can select modifiers, but you don't have to. Only one modifier can be used per hotkey. Select a key from the keylist (Drop down menu). In order for the program to work you must select a hotkey for every command. IE: Play/Pause, Next & Previous.