I Just got myself "Medieval siege weapons (2) Byzantium, India and the Islamic World" and thought I would share something from that book, may be useful if BC wants to portray the technology used in the Middle East more properly in a later version.
Torsion Powered Engines
Of these I am sure that the Muslims used both types, they usually adopted whatever seemed good that they encountered, and that the Byzantiens used at least the alakation
The largest type of Qaws Ziyar described by al-Tarusi
Byzantine alakation or ballista
Great Crossbows
All these are Muslim weapons... except the first one which is also Byzantine.
Frame-mounted toxobolistra or jarkh
Crossbow to shoot 'eggs of naft' (this one looks and sounds pretty awesome)
Multiple crossbows in a rotating tower, according to al-Tarusi
Mangonels
There are four types of mangonels + the counterweight mangonel AKA trebuchet, the Muslims used all types. Counter-weight mangonels were introduced in the mid 12th century and put to great use in the late 12th century.
'Turkish-style' manjaniq (mangonel)
Rumi or 'Frankish-style' manjaniq
Lu'ab or swivel manjaniq
Byzantine petrabole or 'Arab-style' manjaniq
This was the most complicated, but also the most accurate and reliable of the (non counter-weight) mangonels
Earliest known type of counter-weight manjaniq as described by al-Tarusi
Pyrotechnical Weapons
Incendiary weapons were widely used in the Middle East, most extensively by the Muslims. An important thing to note is that they made siege towers, and other wooden ramparts for assaulting walls, obsolete. Usually only elite fire-troops, naffatun, operated pyrotechnical equipment, they had very high status, pay and training. Though the simpler grenades could have been used by urban militias and some other troops as well, many were "simply" projectiles for missile weapons (ballistas, crossbows, etc).
Naft Zarraqa... Flamethrower!!
Ceramic grenades
Incendiary missiles
Hand-gun, late 14th century
Enjoy!