Pro Tools lets you choose a preference to work in Film or SMPTE format.  Many users get confused by this because they think that it affects their speaker layout or how audio is handled internal to Pro Tools.  This setup choice only affects the default order of Pro Tools hardware inputs and outputs.  It is not a speaker layout but rather a preferred hardware channel output ordering.  When you set up a bus, input, or output in the I/O Setup dialog, Pro Tools will order them according to your preference by default.  You can always modify it after it has been created.   As long as you connect your monitoring system or layback VTR correctly, you can use either order.  Often VTR layback delivery specifications will order tracks in SMPTE order so it makes the connections more straightforward.  If your monitoring system is connected to output channels 1-8 as L,R,C,Lf,Ls,Rs, then you should use SMPTE format to simplify creating your outputs.   The setting has no effect on how Pro Tools deals with 5.1 internally.  Pro Tools always displays tracks and meters in film order and always makes all internal connections to plug-ins in film order.