I don't like changelings only being able to mimic people they've seen. Why can't I look like whatever my changeling WANTS to look like? That move weakens their ability to play to themes of identity and personal choice that play into Eberoon's modern themes.
It makes perfect sense to me. If you have never seen an orc before, how could you change your form to mimic one? As a DM, I would rule that the common races of Eberron are an automatic go for
shapechanger, but something more exotic like a catfolk might not be. Or if the player wants to
shapechange into a race they have heard about but not ever seen, I might require a deception check to see if they pulled it off convincingly.
Dragonmarks are interesting!. I kind of wish there was a better way to have them represented than feats...because it's not a comfy fit...(characters won't be developing marks until after 4th level unless they're human...), and not every game is going to have feats....but I suppose that is the best home for them.
How else would you model dragonmarks, if not through feats? If you are playing a campaign that relies on them, you could give all of your players a free feat at 1st level. Or, allow a player to *have* a dragonmark, but without powers manifesting until 4th level when they take the feat.
What confused me about the dragonmark rules . . . do you need to take the dragonmark feat three times to gain a greater mark? Or does the mark automatically improve with level? The wording used implied both at different points . . .
Hmmm, maybe a dragonmarked character could be modeled as a subrace?
Similar problem if you develop warforged feats for different construct bodies. Would a warforged built with the equivalent of plate mail require a feat . . . . or a subrace?