Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

If you're including crossbow archers, the following two might be interesting. They are deep gnome builds, but can be made with rock gnomes as well.

http://nwn2db.com/build/?197427
http://nwn2db.com/build/?198255

There is also the option of sending a summons in to keep the enemy away and support them with archery (though I picked bullets here for the better AC).

http://nwn2db.com/build/?202177

First 2 builds have ECL2 and an XP Penalty. Last is very low CL, i.e. will be dispelled.

Not to be recommended to any but masochists.