Maintain the specified dropped weapons in the world. Designed for surf rpg/combat servers (maps with game_player_equip entities). For other modes (casual/competitive) just use the weapon_max_before_cleanup convar. Designed for CSGO. Might work on CSS.
https://forums.alliedmods.net/showthread.php?t=319675
sm_weapon_max_before_cleanup 24 // Maintain the specified dropped weapons in the world
sm_item_max_before_cleanup 16 // Maintain the specified dropped items in the world.
sm_c4_max_before_cleanup 1 // Maintain the specified dropped C4 in the world.