Thanks for the comments. In version 1.0.2 which is on testing right now (available to download, see the beta forums) I've added anyway some of the features requested by slugthog and Jude.
About your request, I have in mind of creating yet another screen "Build your custom ship", so I'll add that feature in a future upgrade. initially, each device had a "energy" value, so that you could basically put on any ship, any device you wanted, creating lot of combos (the only limitation was the total energy consumed by devices, that must not exceed the energy production of the ship).
Later in the game found out that by doing this player could easily discover deadly combos
that is almost like "cheats". So I would have to test it carefully and maybe also add another parameter like size (so that you couldn't put a huge mega cannon on a scout, for example!). So, in the end I decided not to implement it in the initial release, but the code is there, and is a feature that can be "easily" added.
I just need to find the time to program the new screen and implement all the features.
For now can only tell you that I have planned to add that feature, but not very soon: first I want to add also the skirmish mode within 1-2 months, then probably next big update will be this one.