More than just a DD. Support/control thieves, get in here!!
You might enjoy my support thief guide here:
https://forum-en.gw2archive.eu/forum/professions/thief/Kirin-s-Guide-for-Aspiring-PVE-Support-Thieves
As for specific builds, I think it varies based on how you support your party, and what works best for your playstyle. Any build with Venom Sharing and Lotus Poison is off to a good start.
You might want stealth on steal in this build, hidden thief I believe. Awesome buff for that extra confusion and importantly giving you more freedom to strike well with pistol whip. Here’s my stealth/mitigation setup I’ve been playing with. Sigil of energy in both of my sets and heart seeker as a sprint spam when needed http://gw2skills.net/editor/en/?fYAQRAoY8alcmaPHcy5E+5ExmCfKUuHF1oItTBX1KA;TwAA2Cmouxcj4G7Nubk3s+Ygx+jJGA
(edited by obtuse.8291)
When doing dungeons, I roll with almost exactly what you have except 20 in Acrobatics and 30 in Trickery. Since I depend on condition damage for my damage, I run D/D and Shortbow, almost exclusively using Death Blossom with D/D to get the bleed count up. Shadow Refuge helps incredibly much and is a must in dungeons. I use tripwire to knockdown the enemy, and Shadow step to get away.
My tip for your build: If you’re going Trickery instead of Power, you might want to switch to the dagger for the bleed. Or you can use the poison from your short bow and attack with your sword, but I’m unsure about how that will work since sword hits for high power mostly. You could also remove 10 from Acrobatics and put them into Power, or just go all out power, acrobatics and shadow arts. It’s all experimenting, even I haven’t tried enough so don’t depend on my ideas.
I really don’t know how to support in SPvP, so hopefully you’re talking about PvE.