mbtiles : Custom tile size

[Glujaz]

Feature description

I need to modify the tile size of a motile export. Right now, the tile size seems to be 256px, an I would need to go up to 512.
It is possible to do it on the directory export in the raster tools, but why not on mbtiles export ?

I'm asking because rendering 512px tiles is making the resulted map look sharper.

So here is why I'm adding the feature request :)

Thanks !

Additional context

No response