[God Emperor]

Supply, I tend to agree on, given the overall scale.

Minimum turns - that just reflects issues such as surprise or trapping of an opponent, although the tactical system doesnt reflect these scenarios in the ship dispositions. Primarily it is suggested just to make the system work ie not disrupt the strategic game level but provide a little variation in the tactical level.

As for how speed differences are taken into account, perhaps slower ships should be left behind. In the scheme of things it may not be such an issue, I for one tend to build colony and cargo warships (based on Destroyer and Lt Cruiser hulls in the early game) just to get that extra one movement point (maintenance cost is hardly ever an issue really) so my ships all have the same movement rate anyway....