The black screen when switching seats is a tacbf feature. When switching from driver to gunner, I could see how it is somewhat realistic, as you cannot change seats instantly in real life. However, jumping onto a .50 in the bed of a pickup shouldn't make you look at a black screen for 5 seconds as the game currently does. It's a minor, but extremely annoying feature that is not a part of the base game and shouldn't be a part of tacbf, either.
I will make a list of all the good (FO) missions so we can get rid of or reduce the frequency of non-FO/insurgency missions (now that I think about it, the insurgency missions may be tolerable if scanner's balance suggestions go into effect).