Describe the project you are working on

A large terrain using heightmap.

Describe the problem or limitation you are having in your project

The height map used by the terrain is usually stored as a 16-bit unsigned int, but godot only supports R16_sfloat. If you want to not lose precision, you can only use R32_sfloat, which will double the size.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Add uint support for all uncompressed formats, they can be sampled, just linear filtering is not supported. But I guess, people who use them should know this.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

If this enhancement will not be used often, can it be worked around with a few lines of script?

can not

Is there a reason why this should be core and not an add-on in the asset library?

it's render core