Superuser on SD card?

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http://androidforums.com – So after successfully rooting & putting Gingerbread on hubby's phone, I decided to finally do it to my phone. All went very smoothly. I'm currently in the process of reinstalling my favorite apps (I'm so glad to be free of the totally useless crap that came stock on the phone!)...anyway, after all was done, I got a google play notification that there was an update for Superuser. Thinking that it was probably a good idea to install the update, I did. Now, superuser is showing up in my "phone only" apps, and it wasn't there before. What's up with that? Do I need to keep the update (General)