I come to Iron Stars from a background of ACW ironclads gaming. I have a few thoughts on ramming I would like to toss into the mix.
1. Ramming in the Aether seems very unlikely due to the potential fatal side effects for the ramming vessel. Ramming is going to put a pretty severe structural stress on both vessels, and if your hull cracks, all the air leaks out...
2. Space is big. I think it would be difficult to manuver a vessel to strike another vessel cleanly given the amount of space available for evaisive manuvering. A glancing hit is not going to be effective.
3. Battleships don't ram. If IS was "Galleys in space" ramming might be an appropriate tactic. As has been pointed out ramming was not used as a tactic by the wet navies IS is based on.
4. Ironclad rams were most effective against wooden vessels and there are not many of those prowling the aether.
5. Spar torpedoes. I would like to see these as an option for FAC. Similar in concept to the Confederacy's Davids. I don't see them being used much on anything bigger. The risks of collision are too great.
Counter arguments are welcome. Of course the main reason for no ramming is that the game designer has said it doesn't fit the game. But I like to see a reason that doesn't break kayfabe.