Crab cider and juice is awesome. I'd try mixing some batches with 'normal' apples;
I've tried making a fully cabapple cider and it was too sour for me, and I like sour...
Crabapple jelly is beautiful.
In NZ it's not just for toast-it's quite common to have it with roast meat, especially pork.
Kind of like cranberry jelly I suppose.
When I make jams and jellies, I nearly always use commercial pectin and quite a bit of lemon juice.
While crabs have high levels of pectin and set pretty well, I find the amount of sugar you need makes things way too sweet for me.
I've only made 'normal' apple butter, but I imagine it'd be great with a mix.
Same with apple sauce.
They make great chutney. I don't peel them and don't fiddle around cutting the the core out, I do
this.
I might reduce the vinegar and increase the water if the apples make things a bit tart.