Supspace? Theoreticly it like wormhoels...not impossible..
Where does the exotic matter scaffolding required to keep open the wormhole not there? Why isn't the end you go through to enter subspace a black hole? The fact that it's glowing means that stuff is coming OUT of it.
Banking in space? With multiple thrusters and a powerfull nav computer it's possible for a space fighter to behave like that.
Such a method of maneuvering would make your fighter
less effective that the flight style seen on Babylon 5 before they started wanking off to "gravimetric" propulsion.
Humanoid vasudans? Also not impossible.
So incredibly unlikely that it's ridiculous to even consider.
Subach changing colors? Maby it's coolin in space or dissolving..also possible.
Radiation doesn't "cool"--the light will diffuse over long ranges, but a laser will keep its original wavelength. Like it or not, FreeSpace is constructed with extreme scientific ignorance, and it's pathetic sensor system is among the worst offenders. You just can't do stealth in space. Furthermore, the Subach is an X-ray laser, so it should be invisible!
I think the FS / SW lasers can be explained as a contained / and/or charged laser blast. I know it is possible to contain or "stop" a laser, they have done it. Whether or not it is possible to contain a pent-up amount of laser energy inside of soem sort of plasma and shoot it is another matter. I think firing the plasma would be easy enough, but eventually the plasma would not contain the laser... hence the "laser's" max range, which would be based on the strength of the plasma field containing it.
Your explanation doesn't make any sense. Lasers are "stopped" either by mirrors, which reflect them, or strong materials that absorb them completely. You can't freeze electromagnetic radiation. The plasma doesn't work either, because plasma is extremely volatile. Plasma molecules desperately want to get away from other plasma molecules, so firing plasma is like firing a blast of steam at an opponent--completely useless, as it instantly diffuses. You might as well say the thing is constructed out of pure technobabble.