I'll answer your Mirage drive question and let the folks that fish salt (beach launchers with waves) answer the surf question. I never pull the Mirage drive out to use it as reverse. In open water I cannot see that need especially if you are on large bodies of water. I have tried it backwards and it does work, but the need never arises.
Usually I have to back up if I'm pulled into or around a lot of trees and do not have the distance or flexibility to get out by forward motion. For those cases I just use the paddle with the t-handle.
If you decide on pulling the trigger and getting a PA, you will love it. I know from reading posts that the PA and surf launching requires practice and a certain technique. I fish inter-coastal in the JAX area and the creeks on the Gulf Coast side when I salt fish, so waves and beach launching is something I have yet to do. Good luck with your decision!
