Yes, it's not necessary to keep adding wood. When I use my weber kettle, I bury a few smaller chunks in the unlit pile of coals when doing indirect, then dump the handfull of lit coals on top of pile. Or if using fuse method, I'll bury a few smaller chunks within the circular "worm" of unlit charcoal, then light one end by dumping a handful of lit briqs on it.
When I say handful, I mean like 10-12 fully lit briqs from chimney starter.
When I say smaller chunks, I'll take a fist sized chunk and split into 3 or 4 smaller chunks. This is plenty when doing stuff like chicken or pork loin.
With the fuse method, I'll setup the wood chunks so they will burn up during the first several hours of the cook, then never add any more.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. SJS Mini-WSM. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)