a. The Ancients are not player-races (they have no research to do) and are just there as a an AI-controlled threat. In one of the versions I failed to include a bridge for the Vorlons
and so they are a tad.... slow. I have fixed this in the next iteration, as well as tweaking the AI_research and AI_construction files to make the AI a little better.
b. WPs have only PD weapons in order to make satellites the primary planetary-defense weapons. This conforms with the show and also eliminates complications regarding the types of weapons that could fire out through an atmosphere.