Have you tested this? I'm doing backup right now, and I might, but I'm looking at the script, and it says it's for Galaxy S. There's also a part on one of the first lines where you have to specify your launcher. Also, I don't think the scripts it our init.d even begin with "S_..", but rather with a two digit number, e.g. "06swapon".
EDIT: I edited the file to point to my launcher "com.fede.launcher", and touched nothing else. Named it "18smooth" or something of the sort, and put it in /system/etc/inid.d. The system failed to boot(never got past the second "LG" screen. Maybe it's the rom I'm using, but this is not working so far. I hope your promised tutorial is of use.
Sony Ericsson MT15i Xperia Neo | Android 4.0.4
MIUIv4 v2.7.6 | Kernel - 18.104.22.168-perf shardul@suave-s #15(Suave Kernel v6)
Rooted, 256MB Swap on sdcard
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