The problem with typing in the name of your captain is it takes even more time to get your post out, and time is NOT on your side in a cap, especially in a lawful capital ship. While you may think it's better for RP, I think it's better for me to get ass blasted by a scylla or a pack of gallic bombers. It might just be me, but I tend to stall in my typing when I try to remember who is commanding what ship at the time, and that's long enough for pirates to get moody and start shooting.
Better RP? Depends.
Is it better if you never get the message off at all?