Nothing else?
With all the talents in the Sunsinger's arsenal, you don't need anything else.
You have a melee that reaches farther than any other sub-class's save for the Gunslinger's Throwing Knife and the Nightstalker's Smoke.
You have a melee that grants you a shield on hit, and this melee happens to burn your enemies for a considerable amount of time.
You have a grenade that does all the work for you and burns your enemies for fourteen seconds, leaving them vulnerable for an unfair amount of time.
You have a super that rewards you for dying with fifty percent damage resistance once you've returned from the dead, and it just so happens that your super allows you to throw one grenade every second over the course of thirteen seconds - the very same grenade that burns enemies for fourteen seconds.
Your super also guarantees that you will kill an opposing Guardian with your melee if it is charged.
Of course, since I'm sure that's not enough for you, you could always go with Radiant Skin which will increase your damage resistance to a whopping fifty-five percent.
Sunsinger is currently the most forgiving sub-class in Destiny - it grants great rewards for little effort and demands zero precision in the process.
Let's hope Bungie turns their tuning tools to Sunsingers next.