I guess changable engines for capital ships would be a bit weird to be honest. They are not freely available and very specific for the ships themselves. I think it would be understandable if they were not changable. Though I must say I'd be very interested in being able to change an engine on a gunboat I got me a short time ago...then again, slapping a Bretonian GBs engine on a LH GB or a Bottlenose for example might be a bit overkill? Not sure how they are actually sized though.
I'd just be happy if transport engines could be changed. Their sizes don't vary so much and more people use them.
And of course...Firefly replacement. Q_Q
Besides that, nice work.
I just hope the sound glitch I experienced yesterday was just some weird bug on my side, just a one in a million thing. I suddenly had heavy sound stuttering when I was doing a mission. (I know I had such before with some other game, or maybe even with Freelancer, wish I could remember what caused that...)
Also I hope the graphics driver (nvidia) crash I experienced while setting in a base was a one in a million bug as well ... I had that constantly with my old computer... I really don't want that bug back.