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Good catch — and you're right that there was no way to do it. The deck builder only knew about one command-zone slot, so for Oathbreaker it would only ever offer planeswalkers: the signature spell never showed up in the picker, and even pasting an Oathbreaker decklist silently dropped it. Any Oathbreaker deck built in Neo Forge was stuck on "is missing a signature spell" and couldn't be played.

That's fixed in the next build. Oathbreaker now has both slots:

Two buttons at the bottom of the deck builder: Pick oathbreaker and Pick signature spell. The catalogue switches to instants and sorceries for the second one.

Starting a new Oathbreaker deck opens on the oathbreaker picker, and once you pick your planeswalker it moves straight on to the signature spell — you don't have to go looking for it.

Right-click any instant or sorcery in the catalogue and you get Make it the signature spell.

Pasting a decklist (Moxfield and friends) now keeps the signature spell instead of throwing it away.

Picking one no longer replaces the other — each slot is replaced independently.

One thing worth knowing: Forge doesn't enforce the signature spell's colour identity (it only checks the main deck and sideboard against the oathbreaker), so the picker doesn't hide off-colour spells. That's the engine's rule, and I'd rather not invent a stricter one than the game you're actually playing.

Also shipping in the same build, from your earlier list: the game log now reads top-to-bottom in chronological order, opens scrolled to the latest entry, and has a one-click Copy log button. Straight (un-fanned) cards in hand is now a setting under Settings → Graphics, on by default as the fan but switchable if the anti-aliasing bothers you at 1080p. The bundled-font issue is a bigger job — Neo Forge does currently rely on the system font, so you're right about the cause; I'm scoping that separately.

Thanks for the detailed report, it's exactly the kind that's easy to act on.