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can i do something regarding to my MAP or i have something which let me stay in limnit ?



There are a few limits when it comes do degining you perfect level you have in mind:

-Maximum level size of WED: -100000..+100000 quants.
-Frame rate: to much details will result in a low framerate.

Thats the only things I can think of atm when it comes to designing your game. But if you want a racing game or RPG to behave the way you want -like a racing game/rpg- then you will have to program some, or team up with a programmer.