Teacups17 wrote:
Out of interest, can a captain assigned to a siege engine lead a warband?
If the siege engine has a captain, he has to lead the warband that includes the siege itself.
That being said, I'm not a fan of the Bolt Thrower. It's too random and becomes useless when the battle starts: while archers can still try to aim at support, the Bolt can't because the friendly unit is too close.
Now, in a scenario like Reconnoitre, where you can just sit and shoot, it could be devastating, wounding D6 at 4+, but most scenarios force to deploy close to the opponent, giving it 2 or 3 turns of shooting at most.