I rooted and replaced the supplicant file under 3.1, and happily, this update didn't remove that file, so no need to re-root right now.Rooting allows you to remove/add/edit files in the system folders. For example, to get the tablet to recognize adhoc hotspots, you need to swap out the wpa_supplicant file in \system\bin folder with a version of this file that has been modified to recognize such hotspots. These kinds of actions cannot be done on a unrooted tablet. Of course, being able to do these actions is a doubled edge sword as you can easily brick your tablet.<br>
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Sent from my A500 using Android Tablet Forum
So anyone considering a downgrade to do the supplicant fix and then a custom rom, you don't need the custom rom if all you care about is the supplicant fix.
Can't wait for android 4.0, just reading about it on the android developer site, looks like p2p will be built in now.