4x Engineering

[xandorz]

You can probably use macro like this (I haven't tested it, but I assume it will work):
/use [@player] GrenadeName

For ranged it would be good if you could get round robin on the grenades so you can have another way to interrupt but not too convenient to use.
To reduce amount of keys you need to press you can try to see if you can get this to work to just have to just have to press hotkey and not mouse click, need to have cursor at right location though:
/use [@cursor] GrenadeName

I don't think the damage will be worth using grenades.
I think for pvp you want to use Goblin Sapper Charge.

You will have to spend a lot of gold to lvl engineering and to use the consumables. For pvp it can be worth it, for pve it is not worth it imo.
5 Goblin Sapper Charge = 10 Mageweave Cloth, 5 Mithril Bar, 40 Solid Stone. Quite a lot of gold to throw away with a press of a hotkey.

[waddles]

Thank you. Good input.

For ranged it would be good if you could get round robin on the grenades so you can have another way to interrupt

That was actually part of my motivation. I am running warrior, priest, 3 x warlock. I was thinking about how I was going to get through WC and the pulls with multiple druids had me concerned. My tank should, by that level, be able to interrupt a single target, but what about multiples?

I started thinking about using bombs on one of my slaves for that reason, and that led me to, "If one bomb is good, four bombs must be four times as good!"

But you bring up a good point. The damage isn't great. It's the stun that's relevant. And without a contrived round robin workaround, four stuns at the same time gains me nothing.