Two things: 1. Discuss location limitations with the bride and make sure you have this in your contract (the Clients confirm they are aware of location limitations for photography). Clients need to have reasonable expectations. The location is their choice and they need to discuss this stuff with coordinators, priests, etc. They can expect certain shots from the back but they should not be expecting say low right angle shots from the first row, or side shots, etc. These are the limitations of the location which they picked, so they need to have a good understanding of this stuff before the wedding day.
2. Scout the location and have a chat with the priest. Speculating regarding lenses before that is really pointless.
Also, when i work with limited movement situations, I do bring primes but having zooms is a must.
Good points. Thanks. I already have something in my contract about not being able to get all the pictures the client may want but I could probably expand this to include explaining being limited by location or staff.