First, I'm sorry to admit I didn't spend a lot of time trying to turn off the keyring authentication EVERY TIME I BOOT UP to connect to my Wifi, but I looked for quite a long time for exactly my problem with Evolution and I couldn't find anything that matched it to my satisfaction.
If I have Evolution open for an extended period of time (sometimes hours, sometimes minutes) it will prompt me for my gmail password over and over again. With a blank password field instead of saving the password like I asked.
The other issue I touched on above. Every time I cold boot, I have to put in my keyring password to connect to my Wifi. Can this be automatic?