I feel he should have daily bounties that reward Mod Components and Gunsmith Materials. As well as one weekly bounty that rewards a "Powerful" weapon and several Enchanement cores.
I also feel they should bring back ammo synthesis and add it to his inventory.
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It just needs to go back to how it was in D1 with gun orders and ranking. Then you get the exotic quests once you reach a certain rank. He was worth visiting each week. The only reason I go to him now is to pick up a gun with a decent roll that has just been updated due to sandbox changes. Don't even bother buying mods as I've got loads of them!