The one thing I'm hoping for in a future update is an 'Unstable" option for format of deck. That way there could maybe be an integrated area to better list contraptions.
Do you know about the "work in progress" option? If you are still working on a deck, you can tick that option. Or do you mean something else?
More so that if you include Contraptions in the deck list it will consider them in the opening hand and mana cost chart I believe. I just figured using the Sideboard option for the Contraption deck would be a work around for now. I guess it's because the cards aren't considered to be in the same deck as Contraptions use a separate library from the main deck. Nothing major of course and Unstable constructed will probably account for very little decks.
I put them in the maybeboard area because they are not subject to the same restrictions as Sideboard, though they have restrictions. A contraption deck must have a *minimum* of 15 cards. The only reason I'd do this is because when making an Unstable deck, my playgroup still constrains the *other* cards to the Modern banlist.
It's probably a hard thing to code for since there is only *one* actual format that uses a separate deck. I
wonder if it might be easier, from a coding perspective, to add an option to add "extra deck" section. Right now, when you use the deck creator, you can add classifications for //land, //spells, //non-creature spells etc. Maybe an option to add a "extra deck" option under sideboard and maybeboard. It would also allow you to make a planechase deck, should you be interested in doing so (I am XD).