@Moirai
I actually can see your point, and I know Enderal isn't perfect. I think I wrote that already somewhere else, but I know that it's linearity is one of the weaker points of Enderal - that is, if you are a player who values choice a lot. The main reason we didn't incorporate more choices is, that it simply wouldn't have been do-able with our limited resources. Basically, the whole story was written, translated, and implemented by just a handful of people, in the end only two (and in the very end, only one person, me). From the very beginning, we had a lot of internal discussion about the scope, and it was very unclear to us if Enderal would ever see the light of day. Now, imagine, you would have been given the choices you were talking about: Essentially, with every decision (provided that it was a meaningful decision), a whole new branch would have opened, which would have doubled the work in every aspect. Teams such as CD Projekt Red or Bethesda usually have, don't quote me on this, somewhere around five to fifteen quest designers (who don't always write the actual dialogue - I think they do at CDProjektRed, but I'm not sure) working on a story, plus, the writers don't do the translation or the voice acting direction (which is a full-time position on it's own). Not to mention that they have artists, scripters, coders, animators, you name it. Basically, we had to do all of this on our own, and most of us had a day-job, at least part-time. I think this is a very important aspect to consider.
That being said, I think if the DLC I plan on developing is going to happen (more information on that soon), there will be a secret ending like the one you were talking about. I thought a lot about this, and I did, under no circumstances, want a "perfect ending" that took all meaning from the story. What I came up with now, is, I believe, a very haunting, beautiful and meaningful alternative to the two current endings which adds a new layer of meaning to the story. Also, I hope that the way of "unlocking" this ending is really interesting. Also, given that there will be a lot of new story content (guilds, very cool side quests), I think that will add a lot of replay-value to the game.
Best,
Nicolas