If you do next map "!nextmap" then it just load the next map. but you could add a own command like i did.
it seems you use noquarter if iam right, is there a commands.db file like in nitmod?

**********

name = map
exec = map [1]
desc = choose a map with !map mapname
levels = 888, 999

**********

name = devmap
exec = devmap [1]
desc = it loads the map with cheats enabled like /god /noclip /give all. Choose a map with !devmap mapname
levels = 999

**********