The maps are from ASW I think. (I'm not completely sure ill be honest) Aside from that its the same old subspace.
Okay, cool.
As it turns out, editing those ship fields would require me to create a duplicate ship entry anyway. I was hoping there would be a purely sexp-based solution.
That isn't applicable for ships that warp in, only for ships that are present at mission start.
A ship with lower initial velocity (like 0) will make full stop sooner than a ship with higher initial velocity (like default 33) upon exiting from warp. In case of a bigger ship, the difference in distance traveled should be quite remarkable.
At least that is my experience from the few missions I fredded back in the old days.
I just tested this, and the initial velocity made not one whit of difference, either on retail or latest SVN. I used a mission with two Hatshepsuts, one set at 0 initial velocity and one set at 100, with both cued to warp in at the same time.