Now I've made some progress with the Autoinstaller script

It will now check that you have over 20% battery left, and have a memory card inserted as well(not a fail-safe way, but meh). Most I have left is to check capacity of the memory card and give appropriate warnings, and also do MD5 check of files

EDIT: It *should* also flash the kernel but R&D mode need to be set manually on a computer..

EDIT#2: And if giannoug's solution for R&D mode work there wont be any need for a computer