Yeah, it is a good point, and I've considered it. I've actually wondered if it would be ok to have it understood from the start that SOME things will change during updates so that you may get your episode 5.0 bundled with episode 2.3. I'm not talking non-linear shifts in plot, so I will be planning that out, but small improvements or even new areas opening up. I've considered making it a level in which things shift around dream like anyway, so that you go to a screen once and it looks one way, you return and things are slightly different. So episode updates would fall perfectly in with that, especially considering the trigger would simply be the finishing of the prior episode.
Hopefully that made since.
But just a little more on plot, I think I'm going the route of throwing a dozen puzzle peaces out their which not even I know all the implications of yet, but leaving them open ended enough that I can weld them together later to form a cohesive plot. It is a little dangerous because you can trap yourself into something that doesn't feel quite right, or might not even work, but I believe I can pull it off successfully.
And on the side,
@LPChip: So, was my question not technical enough for the level editing support forum, or was it too broad for it? Just wondering how to judge that for future posts.