2) Did not work. Setting the key in liblist.gam gave this:
Host_Error: Couldn't get DLL API from .\valve\addons\metamod\dlls\metamod.dll -num_edicts 2047! Screen
Adding the key to the console did not help at all, the game crashed after 20 minutes. Is there a way to get rid of the garbage entities, like the ones that are not used anymore?