Something of a hindrance I ran into again recently while making new ship designs is TDM's stiff requirement for ceiling height to avoid that the blackjack is deflected.
I've tested the absolute minimum to be 104 units, with the safe minimum being 120 units in case the player is looking up a little. Every 1.1 units is an inch, so the blackjack needs 9 feet or 2.7m of clear space to work.
In terms of ship design it'd be a godsend if this were less stringent, because at the moment I'm, for example, only getting 2 decks out of ships that realistically should have 3 decks. Other situations are also affected, such as blackjacking under hanging lamps or doorframes, or making other cramped spaces.
Four ideas for possible ways to solve this
1) let weapons ignore worldspawn like they did in Thief. Ideally this would be accompanied by a new spawnarg for entities that they shouldn't collide with weapons.
2) make the blackjack less aggressive to surfaces that aren't AI heads. Maybe it's possible to use a second smaller collision box for non-head surfaces?
3) reduce the blackjack's vertical arc.
4) make the blackjack's collision box move in a straight line rather than arcing.