1. Yes, I replaced the injector O-rings
2. I didn't disconnect the fuel rail from the fuel lines. It is fairly easy to move around without disconnecting it.
Here's everything I replaced, from Bill Jenkins:
F5RZ-9P867-A x 6, fuel rail to lower intake seals, total $13.32
F5RZ-9229-AB x 6, top injector O-ring (the large one), total $17.16
F0PZ-9229-A x 1, O-ring kit (comes with 10 O-rings for the nose of the injector), total $7.57
F4SZ-9C968-A x 1, fuel pressure regulator, total $41.81
F5RZ-9439-B x 2, lower intake gaskets, total $18.10
I also replaced the upper intake gaskets -- I've had those for a while so I don't have part no's or prices handy.
This whole procedure (description, pics, parts, etc) is only valid for 95-97 vehicles. 98 + uses a different style fuel rail and injector. SVT is different yet again.
-Lance