I just reverted my viper from ZVK to ZVI and gained root access. I noticed that if you begin removing unwanted system apps the ota update to ZVK will not properly install. If you want the ZVK update after rooting, use root keeper, update ota to ZVK and then begin removing unwanted system apps.
I used root app delete to remove a lot of bloat-ware without causing a security mode. When I rebooted after removing Google Play Movies my phone entered into security mode. I'm going to guess other apps that I do not have listed below will cause the security mode but it will not known until the phone is rebooted after removal. When my phone entered security mode, I had to flash the rom. Thankfully only play movies kicked in security mode because the only way I know to get it out of it is to reload the rom, root and try deleting again (PITA).
I removed the following apps without issue:
youtube (I use the built in Chrome player and have flash loaded back to my phone)
wallet
telenav
google play books
google play magazines
google+
music player
music
shopper
ploaris office
sprint id
sprint zone
sprint tv
sprint nba
sprint music
video player (I use MX player)
talk
tags
voice dialer
power control widget
favorites widget
streaming player