Howdy Udet,
I have to imagine that you're unfamiliar with basic science and military strategy. Either that, or you're putting us all on.
Since B5 had chokepoints (static Jumpgates stationed at Lagrange points), there was no need to defend wide swaths of space against attack. If an enemy wanted to, they could jump into the outside of the solar system and accelerate inwards, but then they would have a very limited opportunity to attack and would have no abillity to hold the position they took. It's a legitamate tactic, and there were examples in the series where people did exactly that, but most of the time they did the low relative speed combat because they needed to actually engage and destroy their targets, not just run past them.
In regards to escape, that was easy, and the only times people were unable to escape from a fight was when the enemy used the recharge time of their jump systems against them (eg, launching a sneak attack on a ship right after it jumped in, using previous knowledge of its arrival) or when the fight was in close proximity to a gravity well.
All of the combat in B5 was based on real newtonian physics. They had limited fuel supplies, and there were no free lunches in regards to kinetic energy.
So just to be clear, you're arguing from a position of ignorance (because you don't know anything about B5). Also, your argument is posited upon a pretty silly assumption (namely, that it's not possible to fight in space using real physics).
Almost all of the fighting is done at Lagrange points.... do you understand what that is? I assume you don't because you keep trying to stuff figures like 32k fps into the conversation.