Of course, the room is #1. We all know that yet keep going on with subpar acoustics. Well, I do anyway.
Actual Faders and real inline eq manipulation would be nice.
I don't know or understand fully the logistics of using a controller such as Mackie control or something but, in my mind, if I got something like that, it would need to be at least 16-24 channels and "just work". And from the various threads I've read over the years, it just seems more of a pain in the ass than what it's worth. Sure would be nice though.
Then there's always, good references, and practice, practice, practice.
Or, somehow turn the $5k into $100K and get a real mixer with full automation.