@ H-Hour
Thank you very much for putting your time into this.
terrain - if it is ok, fine
lights - i have no idea about the lighting, because i did'nt anything about this yet, so i will just follow your advice and do as suggested (as this requires changes on the four main parts of the map it may take a while to find the time for that)
long hallway - this problem occours all over the map, i will work over that, put in some more rooms and stuff to break that