The rule for targetting weapon teams in the skaven book is along the line of "The weapon team gets the same protection from shooting as an individual character within "3 of a ranked unit, if it is within 3" of it's parent unit"
In 6th, this meant that it couldn't be picked out. In 7th, characters receive no such protection from shooting, and neither does the weapon team.
Also note that although Jezzails and weapon teams are skirmishers, they are US2, so you don't suffer the -1 to hit them with shooting.
Regarding leadership - if they don't have a rank bonus, they don't get to add it to their leadership. Simple as.
I do however, resent the idea that Skaven players 'almost always' ignore or deliberately misinterpret rules.