Bump to get more input to the this thread.
I tried using the *#0011# method when my wifi was repeatedly disconnecting and it did keep me connected to the router, but it also drained my battery, going from ~40% to 15% over the course of 5 hours without any activity by me on the phone. It seemed that the orange download arrow under wifi was constantly lit, so I'm not sure how the power save mode made it constantly transmit data (I don't even know what it was downloading). This would be more of a concern to me than having to re-toggle the power save mode with every restart, although that would be annoying too.
Has anyone else who turned off power save mode noticed a significant (like my 25% drain over 5 hours without any activity) power drain?