Maximum hit points
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When playing on Arelith, the setting of Arelith server will override this option and maximum hit points will be always granted to a PC.
For single player or own server
Players can change their settings to automatically maximize hit points.
In file: nwnplayer.ini
under [Server Options] heading
Max Hit Points=1
(if the line isn't there already, with =0, then add it. If it's there already, make sure the value is 1).
Note - this only works when you're the server. Arelith has it set so you don't need to do it for playing here.