Ok, I made a few changes.
I set the fWait to 3, in testing insingle player, it now seems to appear reasonably enough of the time, but not overwhelmingly (depends what the other missions are set to of course).
I've added warp back in, the ship will drop out of warp out at the beginning of the mission (including warping in sound effect) controlled by the script (you don't have to do anything, it just happens). This only applies to the attack ships to simulate warping into the system in an attempt to intercept the freighter convoy. The freighter convoy and defender ships begin at speed 12, the freighters are restricted to a maximum speed of 12, however, some freighters in the OP+ 3.4 shiplist cannot even get to speed 12 anyway.
I made a few other very minor changes to in game messages and starting positions as well.
I'm just waiting now for Chuut to come back on MSN so I can give the mission to him to upload.
Please run this mission so I can get some feedback, please