In reading the rules for the Tantive IV, the explanation of the new range ruler stated that ships get to roll additional evade dice at ranges four and five, but did not specifically indicate that it only applied to the ships primary weapon, which is unlike the standard rule book's explanation of defending at range 3. Was this intentional, or do ships being fired on at range 4 & 5 roll extra evade dice against secondary weapons as well (which would basically make the single laser cannon all but useless...)?

Secondary weapons dont get/give extra dice for range. It's just a general, global rule for secondaries, the rules would have to provide fir a specific exception for it to be otherwise, so no, single turbolasers do not give the target bonus agility dice for ranges 3-5.

Which would make the Singles well and truly suck.

Bad enough trying to shoot a Tie Fighter with one, imagine if it got the extra dice, and rolled 9 defense dice...

Well, they are so small, they can evade turbo lasers.

alright, next time i have a question i'm just going to double check the rules instead of posting a question at 1 am: "If a ship attack at Range 4 with its primary weapon…yadda yadda." (Tantive IV rulebook, page 2). Pretty clearly stated there. Thanks anyways guys!