4s and msl on sprint

[rokit8]

So glad I finally found guys who are doing things and helping people out (thanks to all you administrators, amaamore, rich hathaway, whitey, and all). I have an iPhone 4s from sprint running 5.01 with modem firmware 1.0.13. I jailbroke and put prl using ssh and i'm able to dial cricket. I have patched commcenter with v.backspace.jp from cydia. But then I read (most of this forum) that I need to reset the msl before I ota. It says to "look at the old 4.2.7 or 4.2.6 Bundle from Verizon" and then something about security with scripts to msl and copying into my bundle. Does this mean I should be making my own bundle and adding scripts there?

This msl script from 4.2.7 is supposed to be in the zeppelin_us bundle? Is there a way to extract from 4.2.7 ios ipsw? Chris in other posts said he has bricked a ton of iPhones with simple scripts so I'd be more comfortable to perform the msl actions manually (if that would be safer).

Again, i've read the whole forum into the night and don't see much interest on this topic so if anyone cares to elaborate I'll sincerely appreciate.

ps. when will they have ability to cook roms for iPhones like they do at xda developers?