I'm gonna be that annoying guy.

I'm sure it's going to be worked on, but of course ALttP scrolling. Another thing I feel is important is some sort of way to talk to NPCs/signs without the use of a script.

A big one would be to get rid of the subscreen, and use subscreen elements ON the actual screen, like a normal 3D Zelda games. I know some ZC quests have attempted and succeeded with this! It would be amazing to use from the get-go.

Good luck on making this semi-new engine!