I'm not sure how to put these into the page exactly so someone else with knowledge on controllers could: http://steamcommunity.com/app/311340/discussions/0/613941122619835287/#c617319460827117256 http://steamcommunity.com/games/311340/announcements/detail/252527885602176472
Topic on Talk:Metal Gear Solid V: Ground Zeroes
Basically Dualshock means Direct input is supported, so that's good to note. Next thing is that you know that controllers are definitely going to work so controller support is true, but there's still no way to find out does something require keyboard and/or mouse (launcher, etc.) then full support is unknown.
Rebinding is simply true, controller remapping would be false as you can't individually bind the keys, but it's good to note that there are some configuration available, basically state that there are 4 presets.
If unsure just put references all over the place so it's easy to fix if you mess up. Game isn't out yet so information will change and people will edit article.
Why dualshock would mean DirectInput?
Because when you connect DS4 it works as a DInput controller.