On my rogue, I loved Goblin Sapper Charges. Ambush the FC, hit the sapper charge. Usually, the flag was dropped before the healer even knew what happened. It was almost a suicide mission, but, I've returned many flags that way.
Discombobulator Ray - other twinks hate that.
The cloaking device I would use in WSG on my shammy. I'd hit midfield, see 4-5 coming at me, hit the trinket and just keep going. Pets and succubus and anyone with lesser invisibility detection can still see you. One hour cooldown was a bit frustrating, but, it did surprise a lot of people. I think many people thought I left the battleground and would give up the chase.
It used to be that explosive sheep would follow a rogue even if he vanished. Now they are about as much fun as a target dummy, but, players still wonder what it is and will blindly attack it.
Can you wear leather? Gnomish Harm Prevention Belt. And for D, the Catseye goggles are a must.
I remember holding D in WSG with another guildmate that had catseye goggles and an instant cast spell (druid/lock/mage) and he would tag them, they would generally run a little and I'd do the cleanup. From where I stood, once you hit the 'pad' in the flag room, you were visible unless you were 3 points into MoD. Rarely did anyone ever touch our flag and if they did, they were dead/snared within an instant.
I thought about making a twink without engineering because I didn't use grenades or frag bombs frequently, but, the trinkets and other goodies were what I used much more frequently. I know one twink guild requires all twinks to have herbalism/engineering post 3.1.