Just use
https://forums.alliedmods.net/showthread.php?p=598817 (Custom CFG's) Then add u can use
https://forums.alliedmods.net/showthread.php?t=272017 (Deathrun plugin) if u want deathrun maps on ur server also. In mg_ cfg add "sm_rcon sm plugins unload abner_deathrun" to stop deathrun plugin from loading on mg maps.
ur mg_.cfg should look something like this.
//Plugins
sm_rcon sm plugins unload abner_deathrun
//Physics
cs_enable_player_physbox 1
phys_pushscale 900
//Movement
sv_accelerate 6.5
sv_airaccelerate 911
sv_friction 5.0
sv_gravity 800.0
sv_enablebunnyhopping 1
sv_autobunnyhopping 1
sv_maxspeed 2000
sv_maxvelocity 2000.0
sv_staminalandcost 0.00
sv_staminajumpcost 0.00
sv_wateraccelerate 10.0
mp_solid_teammates 0
//Bots
bot_quota 0
bot_kick
// round specific cvars
mp_freezetime 0
mp_roundtime 30
mp_timelimit 30
mp_roundtime_hostage 30
mp_roundtime_defuse 30
mp_startmoney 1000
mp_c4timer 45
mp_fraglimit 0
mp_timelimit 30
mp_maxrounds 15
mp_winlimit 0
mp_playerid 0
mp_spawnprotectiontime 10
mp_autoteambalance 0
mp_limitteams 0
//Weapons on round start
mp_ct_default_grenades = ""
mp_ct_default_melee = ""
mp_ct_default_primary = ""
mp_ct_default_secondary = ""
mp_t_default_grenades = ""
mp_t_default_melee = ""
mp_t_default_primary = ""
mp_t_default_secondary = ""
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
dr_.cfg and deathrun.cfg should look like this (u might need to create a new cfg for deathrun_)
//Plugins
dr_enabled 1
//Physics
cs_enable_player_physbox 1
phys_pushscale 900
//Movement
sv_accelerate 6.5
sv_airaccelerate 800
sv_friction 5
sv_gravity 800.0
sv_autobunnyhopping 1
sv_enablebunnyhopping 1
sv_maxspeed 600
sv_maxvelocity 600
sv_staminalandcost 0
sv_staminajumpcost 0
sv_wateraccelerate 10.0
mp_solid_teammates 0
//Bots
bot_quota 0
bot_kick
// round specific cvars
mp_freezetime 3
mp_roundtime 5
mp_startmoney 1000
mp_c4timer 45
mp_fraglimit 0
mp_maxrounds 30
mp_timelimit 30
mp_winlimit 0
mp_playerid 0
mp_spawnprotectiontime 10
mp_autoteambalance 0
mp_limitteams 0
//Weapons on round start
mp_ct_default_grenades = ""
mp_ct_default_melee = ""
mp_ct_default_primary = ""
mp_ct_default_secondary = ""
mp_t_default_grenades = ""
mp_t_default_melee = ""
mp_t_default_primary = ""
mp_t_default_secondary = ""
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
Make sure u edit out gamemodes_casual/server.cfg commands.. These commands can effect mg_.cfg etc (They sometime override the commands).
GL have fun!