What I'd really like is for Mk. II scouts to boost a Mk. I scout starship (as Mk. I scout starships are faster, I believe), but perhaps this is overcomplicating the code for a very tiny benefit.
Also, obviously the group move moves at the speed of the slowest unit - but it will automatically speed up when all the slower ships have died off, right? I'm assuming that already works, but again I haven't tested.
Thanks for your prompt replies and fix, by the way!