My answers inside your below:
Don't allow computer to turn off adapter is the master setting. Is meant to block the wireless adapter from being incorrectly configured by the computer manufacture power setting.
http://support.microsoft.com/kb/2740020/en-us It is usually only relevant if the issues are when a computer is coming back from sleep.
This is obviously a software problem related to the OS and the drivers - the fixes I am trying are not about how things are "supposed" to work, because they are not working like that. It's more of an anything and everything approach.
Updated Driver
Before you installed the driver did you notice if the current driver was the same version or if you got a newer one?
Did this make the issue go away 100%?
I now have an Intel Pro/Set wireless icon in my task tray - I didn't have that before. After I reinstalled the driver in the 2-step fashion I described, it dropped the connection much less often, and held the WiDi for the first time ever, but still dropped the WiFi connection sometimes, just much less, so I started tweaking more settings in the adapter.
Turning off windows update
First on the update section of your post. Turning off Windows update is not a good idea. Most of these updates are security related and the rest are bug fixes or enhancements. The rest are updates to things like Flash Player which has to be updated through
Windows Update.
I could not care less. Windows 8.1 updates have caused me enough grief that I had to do full wipe and reinstall of the OS after having the machine for less than 4 months. My machine is working properly now, so I turned Updates off - I don't want it mucking with my machine anymore. If you surf around the web you'll see that people are having no end of grief from windows 8.1 updates these days. I'll take my chances on the security related issues. I'm running script blockers as well as anti virus and a VPN.
Second, when you said, "[...] last time I did an update, the problem started again right away, and I had to do it all over again." Do you mean that the problem started again or that the problem started again and the settings reverted or the problem started
again and the driver reverted?
I didn't check, don't know.
Smart TV issue
You mentioned that updating the driver fixed some other issues such as it stopped dropping the wireless streaming to your Smart TV. Can you explain what was going on there; what type of error did you get? For example, did the TV or computer not see one or
the other. Did you get a limited connection notification at the same time the TV connection stopped working? Can you get it to stream when you see the connection has a limited status?
Wireless streaming either connected then dropped a few minutes later, or didn't connect at all. Now it connects most of the time but is still a little buggy, but when it does connect (sometimes I need to remove the TV from Add/Remove Hardware, and reinstall it), it holds the connection now, with some lag.
Thanks for letting everyone the status and what you have been ding trying to solve the issue.