Yes
Rules As Written. Page 24 specifically states that the "weapons can aim and fire at any target within range" NPCs are targets within range. Therefore, yes. And the enemy did so in turn. Why would I not let them do so?
Rules As Written. Page 24 specifically states that the "weapons can aim and fire at any target within range" Weapons are targets within range. Therefore, yes. And the enemy did so in turn. Why would I not let them do so?
Rules as Written. Page 24 specifically states that the ship can be moved up to its maximum speed. The NPC on the spelljammer helm (they were passengers who had hired the ship going to go from Point A to Point B) moved the ship up to its maximum speed on its turn. This caused no issues and needed no rolls. Why would it need rolls?
Yes. The ships got within 5 feet and they jumped aboard the other vessel, following Rules As Written.
Yes. Rules As Written specifically allows, and even encourages this, in the "Shipboard Weapons" sidebar on Page 25. One group commandeered a weapon, while the wizards slung spells.
It was fun, easy, and needed no further rules. Yes, more complexity could be added to the system. But it doesn't need to have it added...