The music sucks, eh?
You want each of them 5 minutes long? But they only have about 2 minutes worth of music. I could loop them a couple of times to make them 5 minutes long, but to what end? during gameplay, the themes loop constantly, but you'd hardly notice the fact that you're hearing the same theme over and over again since you're too busy playing, plus, most of them actually don't play for that long since the music is dynamic and changes according to what's going on. I can't honestly believe that you did the same thing (e.g. just flying, or just fighting someone) for more than 2-3 minutes or you'd probably begin to find the game quite boring.
If it's dynamic music you want, you can check out my Wing Commander 1&2 inflight mix. I took various themes and mixed them together to make one long theme (i.e. Launch theme transforms into Patrol theme which then transforms into a Dogfight theme etc.) all transitions are very fluid and are mixed very well together.
The thing is, WC1 & WC2's inflight themes were extremely short. usually not more than 30 seconds 45 tops.
Privateer's and WC3's themes were longer, more like a minute and a half and more. to mix them together would be overkill. While the WC1&2 mix is only about 6 minutes long, it consists of almost 10 different themes. In the case of Privateer or WC3 a 5 or 6 minute mix would consist of 3-4 themes at the most.
Other than that, any complaints you have on the themes should be lodged against the composers. I only recorded them.