to change the size of a sz go to option on the m2 server
then go to game
then click the map info tab
as you can see my servers sz is 15.what this means is if you where in bw sz
you would set your sz by standing in the centre of where you want your sz to be
then count 15 spaces in all direction.that would be ya sz.if thats to big simple change 15 to 10 5 or what ever
then where you standng the sz would be 10 spaces in all directions or 5 etc etc
then go to sql find the fld called start point.
the spot that you were standing would be the start of ya sz.
so if you put 0 (bw) 330 269
this is where the centre of ya sz is and the cell size you set in the m2server would expand from this point.
hope this explains clear enough.