For disarming turrets. well this could be a SCP bug, because i already detected that AI does not do anything in "disarm" mode... not matter if given by the player or in fred... this is a AI bug... but "destroy subsystem" works well. I also thinking the same about "disable my target" im not sure if this works....
About M9, well i pass it on medium in the first time after download the 1.03 patch(i was tried about a docen of times before that), because before that i was not posible to give to AI the protect my target order, if the sobek goes down, so the Minotaur, after that the Medusas jumps in too damn close to the minotaur, instead 4km range from the sobek.... i didt look in fred, but i suspect that you are using the spawn "near target" and placed the medusas too close to the Minotaur, then after the sobek is destroyed the Medusas just spawn in the placed point, who is too close to the Minotaur....
I made a video of P109 mission i uploading to youtube soon...
P.D. You have touched anything in the tornados accuracy? is on the video and all of yours will soon see, but hell a couple of tornados just do a strange maunover and taken down a Perseus, i was not even think is was posible for a missile to do...
Well, it's a bit of a long story at this point.

The mission was originally designed so that the player would not have to worry about the bombers or the Minotaur at all (at least up to Medium difficulty), but I noticed something stupid just before the initial version was released. The Medusas' arrival target is the Khepri, but after it got destroyed they just kept coming in a silly looking clump at their default location near the Minotaur. I moved them around different areas of the destroyer, at about the same distance from it, but that completely changed their effectiveness. I made various adjustments to the mission to get it back to how it used to be, without moving the bombers back (as I couldn't remember their exact old locations anymore). It should be pretty good now, however.
I don't know about the whole disarm issue. I have not actually given a disarm order in a long time, so you may well be right. The missions never use it automatically.
The tornado is unchanged from the original game. I think you just got lucky there.
Also, Microsoft Sam sounds hilarious in those clips, especially when voicing Vasudans.

I'm just trying this out now... is voice crippled in this 7.9 SCP build? I'm not getting any TTS playback, but I get it in 3.6.9 final.
It may be. I haven't tried it. The missions themselves should now work with voices (at least to the extent that they get played), but these intermediate builds between major releases often do not have voice support.
The campaign will generally work okay in 3.6.9 final, although you may get some odd behavior with the music and a few fade effects near the end will not look right.