after you jailbreak your iPod touch you should have cydia, you can have "super user" capabilities to do things like rotate the screen or use the camera as your wallpaper
obviously, as you cannot get them w/o jailbreaking
Yes, jailbreaking does void the warranty.
"Jailbreaking" is another word hacking. Therefore you void your warranty but you get cydia, a jailbreaking software. Jailbreaking does have it advantages and Disadvantages. But if you want to send it to apple to repair it you have to restore it to factory settings to get back your warranty.
Yes; not jailbreaking it. If you mean a way to do the same thing as jailbreaking without actually doing so, there is no current way to do so.
Jailbreaking a phone is partially legal and partially illegal. I have a post regarding this http://www.techlucid.com/2013/11/is-jailbreaking-illegal-or-not/
It is impossible to get an installer on an iPod Touch without jailbreaking.
It is up to you. No matter what you have on your ipod will become messed up when Jailbreaking...
no, it is not illegal
By jailbreaking it.
No
no
No, jailbreaking has been legal since 2010. However, if you jailbreak, you will void your warranty.