There’s two parts to this, the general and the specific. I’ll probably start with the specific because it illustrates what I’m talking about in general.
So my wife was going through her list of character concepts she’d created for D&D to see how they’d convert over to Daggerheart, since my burnout with D&D and D&D adjacent systems meant that she was faced with a choice of play something different, or find a new GM. For one of them, she was looking at taking multiple ancestry halfling/gnome (gnomeling). She liked both bottom abilities in terms of fitting the character’s vibes, but by daggerheart’s rules, she can’t do that. As a GM, I don’t have any problem with the combo (even if I cared overmuch about balance, that’s probably the mechanically weakest combination of abilities you can get out of that ancestry combo), but since Demiplane follows the rules, she’s locked out of doing that here.
Now I know you’re working on opening up homebrew, so when that drops, I can easily do a workaround for this specific scenario by just creating a gnomeling ancestry that gets both of those abilities. Might not be in line with Darrington’s design philosophy, but my table’s happy, so who cares? But more broadly speaking, would it be feasible to have a set of toggles for common house rules as the meta around Daggerheart continues to develop? In addition to unlocking the top/bottom ability for multi-ancestry, I’ve begun wondering how important it is that you’re locked into your domains by your class (I.e. how much really changes besides giving players more flexibility in realizing slightly off the beaten path character concepts without having to multiclass if I house rule that you get two domains, one of which must be from your class’s list; for that matter how much really changes if I completely decouple domain and class?)
I’m no coder, but depending on how you’ve coded the nexus, there’s a possibility where a simple toggle to turn an existing rule off for character creation isn’t that difficult.
Anyway, like I said, I think a lot of this can be worked around when homebrew gets opened up, but I figured it would be silly to sit at home complaining about her struggling to make her concepts work within the existing rules when only a few small changes gets her over the finish line if I hadn’t at least asked how feasible something like that would be.