Mod, hack, and/or tweak to your heart's content while stock. Just be sure to wipe data/cache/dalvik before flashing another ROM. You don't need to be on stock before flashing any ROM as long as you wipe 1st. Even if u don't wipe and something fudges up you can always flash your NAND (backup) and you're fine. Oh, if u don't wipe, pls don't comment your issue b/c the first question will be, "did u wipe at all?". Have fun!
That tethering mod is permanent so i hope you kept the original files inn case you ever needed to send the phone in for a replacement..
Sent from my DROID X2 using xda premium
What you're entitled to as a member of XDA
Samsung Fascinate - CM7 and OTB oc/uv kernel
Moto Droix X2 - Liberty ROM w/ locked bootloader
SGSII Stock - Wife's Phone
LG NitroHD - HO!NO! Full Throttle v9 1512Mhz; -75uv 192Mhz to 1512Mhz; GPU OC