The S-foil movement should be possible using Bob's sub-object animation code, although finding a way to disable weaponry while they are closed may be difficult. As far as the speed boost, I am told that not all SW games have this as an effect of closed S-foils, so the team may not want to have this. If they did however, perhaps the S-foil movement could be coupled with auto-transferrence of power from the weapons to engines in the ETS. Now that I think of it, perhaps the effect of not having shields in FS, could be converted on a changeable-within-a-mission basis. That may not make sense, but if you remember, in FS1 you didn't have shields at first (or if you're in subspace) and there is no shield entry in the ETS. Perhaps a way can be coded to remove weapons energy from the ETS whenever the S-Foils are closed, and then restore it when they are open. This would also be coupled with the afore-mentioned auto energy transferrence to the engines for the speed boost.