timesink: hm, not sure if i buy that exlanation ;)
for multiplayer as it is, each player needs a bought version of the game to be able to connect.
With a lan mode, theoretically, theres only need for 1 copy of the game, since no external auth server involved.
That also means, that its possible to have multipalyer over wan via tunnels.
So, its at least a possible interest/motivation on developers side, not to offer this kind of lan mode at the release of the game, since it could hurt sales.
on the other hand, id like to have lan mode to be independent from any 3. party will. I want to be able to play a lan session at home w/o any mandatory datapacket leaving the house. From my experience, GoG Customers are mostly thrustworthy, and they buy their stuff. So id suggest take the risk and add that mode not now but in a year or so, when the game reached a nice state of maturity.