on the subject of said choice.
how hard is it to add steam workshop support to a game? after looking at ARMA and skyrim it looks realitilve easy, until you look at all the shitty extras that you probally need
As with any addition it's often not hard to just slap it on - but there's little point in doing in if you're not doing it properly. Some games are easier than others to add support for - PDS games are very modable by nature so that part is easy.
Also remember that there might be a lot more going on under the hood than you might think - changing files might end up compromising other features - so there's a considerable amount of testing required to make sure other stuff isn't broken.
/shams