Mods for Penumbra and other tips

[Dark]

well any game/engine can support netcode
but it depends on what multiplayer you want:
if it is like SS2 (coop) then you need SP levels that can do that
if they are like the techdemo then i would say no
if they do dm/ctf and stuff: i dont think ctf is that fun with melee only :p

about the modding, check here: http://frictionalgames.com/HPLwiki/doku.php
everything you need