There is almost nothing as irritating in the game as being forced to unequip siege to repair it, and some noob comes and steals your cold fire ballista.
We should be able to repair it without dis engaging-- could take the same amount of time, just you wouldn't lose your siege to noobs or trolls.
3 GOs, a Warlord, and bunches of prefects etc-- all classes...I've wasted a lot of time in PVP