Damage optimised rogue

[Artega]

What you took from the comments isnt what I was saying at least.

A group can survive with out a rogue having improved sap. On PvP servers many/most rogues dont have it(contrary to another poster here - sap is worthless now in PvP). You get complaints for not having it but groups use different tactics and gets by but not quite as well.
My point was you are building this rogue to work with a group of friends you say - but the 1 talent that would help your group most you dont want.
In an instance a talent that gives you 5% more damage is not going to help your friends as much as having improved sap.
There is no 3 talent points that can help your group as much as 3 points in improved sap.
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To further reinforce this, without Improved Sap, you aren't going to be doing much sapping (if any) in later instances.

While it's possible to save the rogue if he breaks stealth early in earlier instances, it becomes wipe-endangering in later instances. We had this happen to us in an UBRS run. A rogue failed to go back to stealth after sapping, and a priest reflexively started healing him. We soon had 15 very angry elite mobs tearing through our groups. After me and the other two tanks went down, it ended pretty fast.

You probably won't get kicked from the group if you don't have Improved Sap, but people WILL take rogues WITH Imp. Sap before they take rogues without it.