You could always use VAC Chaos (which is detected, some say gets you banned, some claim it works, up to you) to unlock the console and use commands like...
Or With a little Modding...Code:map mp_ map mp_afghan map mp_boneyard (Scrapyard) map mp_brecourt (Wasteland) map mp_checkpoint (Karachi) map mp_derail map mp_estate map mp_favela map mp_highrise map mp_nightshift (Skidrow) map mp_invasion map mp_quarry map mp_rundown map mp_rust map mp_subbase map mp_terminal map mp_underpass map mp_crash map mp_overgrown map mp_bailout map mp_storm map mp_strike map mp_vacant map mp_carnival map mp_trailerpark map mp_fuel
If you want, download this template I made, everything in the game ins 100% normal but with it you also have custom map rotation and you won't be kicked for being invisible See the main thread for that here. If you don't know how to get started with modding go here.
Other than that there is no way sorry...