I don't know if anyone else has noticed this, but can the ISDs and its variant/sister ships not fire forwards? They can use regular turbolasers and ion cannons, but the main batteries of the Alleigance and ISD-II specifically seem to fire wherever they want when the ship is face what you order it to shoot at.

On a side note, are the space stations just ridiculously tanky? Playing as Zero Command, I have Harrsk, two ISD-IIs, and the support ships he starts with all firing at the same station, but it seemed to survive longer then the ISDs defending it.