Interestingly, snooker cues use metal pins (don't know the thread size/type offhand, unfortunately)
I have a snooker cue from England, the joint is brass and the wood used is ash. I'm pretty sure that's typical.
When you brought up snooker it made me think, they quite commonly make 3/4 length jointed cues. Do any pool cuemakers do the same? That would be a lot easier to lug around vs. a one-piece.