Would be it possible to add orthogonal projection as a view setting? It's is my favorite type of view setting, and is what Minecraft Overviewer used to use. I'm a HUGE fan of this type of projection. It essentially makes it so that all blocks are the same exact size, no matter where on the screen they are, as opposed to perspective where blocks on the edge of the screen have lines going in different angles.

BlueMap's flat-view is orthographic/isometric projection .. just it's top-down and not angled.
An angled orthographic/isometric view is not possible (on further away zooms) since bluemap is working fully with 3d-models and the low-resolution layers are simply heightmaps. Even if i add such a camera setting, it would probably not have the look you are after.

You can find more explanation on this on your discord here:
https://discord.com/channels/665868367416131594/1318998164451360798

Generally, please use our discord for suggestions, GitHub issues are meant for bugs and planned features only :)