I'll have to disagree here. Pretty much anybody that I know that plays PC games (myself included) will immediately look in a new game's option menu to remap keys, especially keys we realize we don't like as we're playing through the game initially. In the current state of PC game dev it's almost unheard of to not have remappable keybinds in-game, but given that's a lot of effort to implement in ADOM at this point, being able to remap keys in a file is a decent workaround. That said, if the remappings in that file aren't actually taken into account in the game, there's not much point to using it.
I find it interesting that none of the testers have asked about remapping keys, given that's the first thing I do on any new game (let alone roguelike) I play. I wonder what they would think about the mind-crafting key (ctrl-i), should any of them happen to try mindcrafter =P.
(P.S. Hope I'm not coming off poorly, I love this game and your dev work, but I think some type of remappable key system that works is important to the reception of this game.)