TTA doesn't have a DAS option? Why is that? It's one of my favorites at WDW.
I've never tried to book a das for TTA, because there's never been a queue, so maybe I'm wrong!
There's no alternate or LL entrance. There usually isn't a CM at the bottom of the speedramp and there's not really much queue at the top. Maybe when the parks are really busy there's a CM at the bottom who can scan your app?
My traveling group doesn't really like MK anymore, so we usually do a morning and are done.