no
No! However if you jailbreak your iPhone then you can install flash.
If you jailbreak your iphone, you can get a package called "frash" from cydia
You do not Jailbreak iTunes; you jailbreak iPods and iPhones.
JP4 is Jet Propulsion Fuel 4, made up of 35% light petroleum distillates and 65% gasoline. JP-5 or Jet Propulsion Fuel 5 is a military specification for purified kerosene jet fuel. There is no JP54
You jailbreak the firmware.
Updating the iPod Touch software erases the jailbreak. You can update, but it will erase your jailbreak.
Yes you can. there is a new jailbreak out called "spirit". Google it "spirit jailbreak"
No. Your jailbreak will remain as it is. Syncing your iPod does not alter the jailbreak in any way.
You can't jailbreak it!
You can get an untethered jailbreak with absinthe.
Do what you originally did to jailbreak it in the first place.