2 - [SPOILER] Event 99 where Pendrake & Featherlake's combined organisational skills allow a barricade to be placed - can they do this just once or multiple times.
Its used once and is discarded at the end of the turn.
If the cards stay a longer time, it´s described in the Intelligence Brifing. Take a look at 74.
3 - If a Villager unit (the Hunt or Shooting Club) have multiple ranged weapons with different 'to hit' numbers which 'to hit' numbers apply to their own attack dice? Or do they apply their attack dice for each ranged weapon attack and therefore use the 'to hit' value of the weapon on each attack. Pretty sure it's the latter.
They apply their attack dice for each ranged weapon. And they can attack up to 3 different squares. See 14.x on page 16.