*more dawngaurd weapons(the corssbow is their varient on a bow and they already have a dawngaurd war axe and war hammer)
*the guy who seels dawngaurd armor sells dawngaurd weapons
* new silver weapons, or atleast being able to temper the sword and greatsword ( I feel like silver weapons goes with the them of this dlc)
*more scmatic quests(maybe a silver crossbow)
I would like to see off the point of dawngaurd specic werewolf enimes in the wilderness very rarly but you never see them outside of the companions questline it woule be a fun enemy to add.
these are just some of the things I ether wiesed dawngaurd had or could be added in future patches.