Have default optional rules changed?

[rocketman]

For someone who is relatively new to the series, it is not obvious which scenarios are stock and which are by a modder. Having the options described in the manual is not ideal when reading a briefing in game. Also, the description of what an optional rule means doesn't make it obvious for me as a player to which extent it will affect the scenario overall, if it makes it more difficult/easy and so on. In fact, I think the briefing screen could be improved to make different versions of scenarios, indended options etc a bit clearer to the player.