You can do that changing the areas frm "maps/sphere_mapX.scp" (X = the map number), IE:
Code:
[AREADEF a_townMinoc]
NAME=Minoc
GROUP=Minoc
P=2466,544,0,0
RECT=2390,366,2546,498,0
RECT=2390,498,2531,504,0
RECT=2390,504,2546,570,0
RECT=2460,555,2567,628,0
RECT=2567,574,2592,628,0 //South houses
RECT=2580,592,2628,646,0 //South houses
RECT=2498,627,2567,690,0 //South camp
RECT=2530,477,2620,550,0 //East mining camp
FLAGS=region_flag_nobuilding|region_flag_guarded
EVENTS=r_default,r_default_rock,r_default_water,r_default_tree,r_default_grass
TAG.GUARDOWNER=the town
TAG.MUSIC=midi_minoc
You can do map modding using a program called CentrED (many information can be found in google and here in the community)
3) This "freezing" problem.. i really dind't understand what do you mean... can you explain again?