Btw: I think it's a bug but you do not want to disable this feature since it builds better ships than user can.Probably minimalization tech(s) not taken into account.
Surely, you don't mean that, Lord Kiron. The autodesigned ships are all horribly slow, thus making them in effect useless (at least to my playing style)
I don't really care how they look, but the fact alone that they are designed with no engines, makes the whole feature kinda moot.
I might consider using the auto-designed ships, the day Stardock changes the feature to make ships with engines.
Morten