I too have Fios but i have the Apple Extreme Router connected to it in Bride Mode. I used another tutorial couple years ago. I am now finding myself having to reboot both the Apple Router and the Actiontec couple times a month. Not sure whats going on. I may just start over fresh. Below is what i used.
http://blog.yagelski.com/2010/03/verizon-fios-and-apple-airport-extreme.html
The problem with putting the AirPort into Bridge Mode is that you are limited to the Actiontec's poor DHCP and NAT services.