First, u have to find this in your server files ..

In marked file (open with notpad), u can define any difficulty as u want. Gonna show u an example:
version=1;
blood=1;
singleVoice=0;
gamma=1;
brightness=1;
maxSamplesPlayed=96;
class Difficulties
{
class recruit
{
class Flags
{
Armor=1;
FriendlyTag=0;
EnemyTag=0;
MineTag=1;
HUD=1;
HUDPerm=1;
HUDWp=1;
HUDWpPerm=1;
HUDGroupInfo=1;
AutoSpot=0;
Map=0;
WeaponCursor=1;
AutoGuideAT=1;
ClockIndicator=1;
3rdPersonView=1;
UltraAI=0;
CameraShake=0;
UnlimitedSaves=1;
DeathMessages=1;
NetStats=1;
VonID=1;
ExtendedInfoType=1;
};
skillFriendly=0.60000002;
skillEnemy=0.60000002;
precisionFriendly=0.28;
precisionEnemy=0.28;
};
class regular
{
class Flags
{
Armor=0;
FriendlyTag=1;
EnemyTag=0;
MineTag=1;
HUD=1;
HUDPerm=1;
HUDWp=1;
HUDWpPerm=1;
HUDGroupInfo=1;
AutoSpot=0;
Map=0;
WeaponCursor=0;
AutoGuideAT=1;
ClockIndicator=0;
3rdPersonView=1;
UltraAI=0;
CameraShake=1;
UnlimitedSaves=1;
DeathMessages=1;
NetStats=1;
VonID=1;
ExtendedInfoType=0;
};
skillFriendly=0.85000002;
skillEnemy=0.85000002;
precisionFriendly=0.64999998;
precisionEnemy=0.64999998;
};
class veteran
{
class Flags
{
Armor=0;
FriendlyTag=0;
EnemyTag=0;
MineTag=1;
HUD=1;
HUDWp=1;
HUDWpPerm=1;
HUDGroupInfo=1;
AutoSpot=0;
WeaponCursor=0;
ClockIndicator=1;
3rdPersonView=1;
UltraAI=0;
CameraShake=0;
DeathMessages=0;
NetStats=1;
VonID=1;
ExtendedInfoType=0;
};
skillFriendly=0.60000002;
skillEnemy=0.60000002;
precisionFriendly=0.28;
precisionEnemy=0.28;
};
class mercenary
{
class Flags
{
HUD=1;
AutoSpot=0;
WeaponCursor=0;
DeathMessages=0;
NetStats=1;
VonID=1;
};
skillFriendly=0.60000002;
skillEnemy=0.60000002;
precisionFriendly=0.28;
precisionEnemy=0.28;
};
};
difficulty="regular";
sceneComplexity=1000000;
shadowZDistance=100;
viewDistance=3800;
preferredObjectViewDistance=3200;
terrainGrid=3.125;
volumeCD=10;
volumeFX=10;
volumeSpeech=10;
volumeVoN=10;
vonRecThreshold=0.029999999;
If u're running regular, only change these settings:
class regular
{
class Flags
{
Armor=0;
FriendlyTag=1;
EnemyTag=0;
MineTag=1;
HUD=1;
HUDPerm=1;
HUDWp=1;
HUDWpPerm=1;
HUDGroupInfo=1;
AutoSpot=0;
Map=0;
WeaponCursor=0;
AutoGuideAT=1;
ClockIndicator=0;
3rdPersonView=1;
UltraAI=0;
CameraShake=1;
UnlimitedSaves=1;
DeathMessages=1;
NetStats=1;
VonID=1;
ExtendedInfoType=0;
};
skillFriendly=0.85000002;
skillEnemy=0.85000002;
precisionFriendly=0.64999998;
precisionEnemy=0.64999998;
};
For no mine markers .. set MineTag=0;
If I was wrong .. sorry. But I would TRY it this way.
