I finally got SourceOP running with Sourceforts and it is fun to spawn entities with e_spawnprop.
The problem is: they dissapear for other players if you disconnect (like the command e_removespawned).

There should be an option to save them until the map is over (even if you disconnect) or better to save them to a file.
Cool would be also if you can optionally auto-load the saved file if you play the map again.