[Suicide Junkie]

As for the engines, I don't propose any changes in the basic system (which I like a lot) just in the numbers of engines needed to reach a given speed. In other words, do things like double every value so that one new engine does the work of two old ones (and maybe have some quad-sized engines so the old Agamamnon has more like 4 engines as in the series rather than 16!)

Doubling the engine thrust will cause problems with the 255 MP limit.
Halving the Engines-per-move of all the hulls would prevent that problem, but would give you some rounding errors.

I took over as a replacement in the B5mod game on PBW, and I think the speeds are perfectly fine as is...

I have 5 MP warships, and 13(!) MP scouts.
I'm pretty sure the speed scale of this game is intentional, and quite fair.

Also, considering the speed of colony development, having slow warship speeds is a very good idea IMO.