FOSS gamedev and creative worlds

I'm just think about a game like Diablo, with isometric view and so on. Would this be possible in Minetest?

No.
Minetest currently has three camera modes (press F7), and all of them use perspective projection, not an orthogonal (like isometric) projection.

But it sounds like an interesting feature. But someone has to implement it. ;-) I don't know how realistic it would be to implement it. If I understand correctly, this basically would just boil down to add an additional camera mode. But I would strongly suggest to not make this normally available to players, only if a mod requests it. This is because Minetest is still mainly played from the ego perspective.

I don't think you should say no as in it isn't possible. Minetest is open source and so just about anything is possible. The question is how difficult is it to change the camera. I thought I read somewhere that it isn't easy but maybe you could alter the "movie camera" mode to make it be isometric. Just an idea :)

The answer is still “No”. It is not possible right now with the official Minetest.
But this can of course be changed, but this needs somebody who implements the feature.

...

Good idea, only keep in mind if someone make it reality, it should be a very polished feature!
And that don't make the game laggy!