I know its is long time since the last post but i found a way to change the maps normally in meatbot without using any of the above tricks.
In the meatbot folders you need to edit the file tdm.gsc. You will find the endMap() function. At the end of it you need to add the line exitLevel(false); and you remove that maps\mp\mbot\_mbot::endMap(); // MBot.
Thats it!!!
It puzzled me for hours until i decided to compare the original tdm.gsc with the meatbot's. I hope someone finds it usefull.