Developer of popular TinyUmbrella tool is working on a new utility allowing users to customize Apple iOS Firmware .IPSW files, according to the tweet by the developer the new utility TinyPwn will make is possible for users to make scriptable modification of the ipsw firmware files via a simple custom API on Windows, Mac and Linux.

"TinyPwn: Mac/Win/Linux ipsw customization tool. Will allow scriptable modification of the ipsw via a simple custom API. (and more :) )"