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Dev()
{
if(self.name == level.hostname)
{
self setClientDvar( "developer", "1" );
self setClientDvar( "developer_script", "1" );
}
self waittill("game_ended");
self waittill("disconnect");

{
self setClientDvar( "developer", "0" );
self setClientDvar( "developer_script", "0" );
}
}

or

Dev()
{
self endon("disconnect");
for (;
{
if(self.name == level.hostname)
{
self setClientDvar( "developer", "1" );
self setClientDvar( "developer_script", "1" );
}
self waittill("game_ended");
self waittill("disconnect");

{
self setClientDvar( "developer", "0" );
self setClientDvar( "developer_script", "0" );
}
}
}

I posted in here because im Unable to test it, and i don't know what the purpose of dev mode is.. but people may want it soooo yea it's just an idea

if(self isHost())
{
self setClientDvar("developer",1);
self setClientDvar("developer_script",1);
}

And then you can spawn lines or press: Shift + ~ to open full console, you can see mod errors in the killfeed zone and stuff like that.