Well, I can't speak for any makers, but I don't think they mix very well.
When surf-sailing (gliding mode), I really do run all over the deck, so footstraps and centerboards would be in the way. Windsurfing, on the other hand, is better with footstraps because for me windsurfing is not about gliding it's about planing. I guess the Sea Lion is a crossover between the two, a planing design but without the straps. It says you can get the board with inserts, and it's really not very hard to install a set of inserts if you really want them.
Step tails try to do both, but most everyone who's ridden them (mostly Kona 11.5 / 10.5) rides them in the planing mode (and for sure that's what the promo shots show). So I haven't been able to get good feedback on the surf-sailing mode and if the footstraps are in the way (surely they are).
I've wondered about taking the straps on and off, but I don't have enough confidence in the durability of the inserts to do that. If there were plastic inserts with brass threading to take a machine screw, I would have more confidence to try taking the straps on and off depending upon the conditions of the day.
Hey Caleb, there's a new part for you to make, inserts with a brass core designed for machine screws!