In addition to choosing a Pattern in Shape Splatter, it would be amazing if you could choose a substance graph to Splatter.
Exposed parameters on the substance graph could generate a Map pin on the splatter node, and 3 sliders: Amount, Random and Map multiplier.

This would be an incredible way to get far more randomness out of splatter

Backface Cull Switch in Substance Designer. Without having to go in and manually modify the glsfx/glsl files, can you please add a switch in designer to enable/disable backface culling? This is especially needed for alpha planes.

Add Support for export using multiple GPU at once in substance designer.

So far substance designer does not benefit from Multiple GPUs. this is extremely important for any work that require to batch bake and batch export a lot of textures, complex textures, UDIMs and so on.

Since Designer is extremely GPU expensive in the export phase it might be helpfull to have this feature, both in designer and in the automation toolkit

It would be useful for scene organisation and readability if node connection lines could be assigned different colours. In complex graphs the number of connection lines can be considerable, and as it's now impossible to click on an output and highlight its path to the end (if dot nodes have been used) this can make following a line to its conclusion quite time consuming.

Designer could greatly benefit from allowing numerical parameter fields to be subject to simple math manipulation.

i.e. If someone wanted to change Perlin Noise 'Scale' from default 32 to some multiple, they could just type 32 * 4 and hit Enter instead of having to mentally calculate the answer and type 128.

Other applications have this feature such as Cinema 4D and Houdini. It allows the user to maintain their speed while working without being slowed down by simple math.

Without exposing parameters ,creating subgraphs etc.
Simply adding new in/out for making same operation to another input.

Base material have normal primary, other diffuse one . In metallic workflow diffuse in unused and empty thus scale is not transferred properly.

Could an option be added to Designer to automatically suppress update reports? We've all seen these pop up when a scene is either from a previous version or references older nodes. I'm sure some like to see this pop up, which completely blocks Designer from doing anything until its dismissed, but personally I'd be happy to never see it again.

A simple node where you select the input image from a dropdown (like in the sampler nodes) and get the size as a float2 vector. A toggle to get the size as log2 would be nice, too.

Only $size of the current node is available in Get Float2.

The use of strings in function nodes is currently very limited as is even stated in the docs: https://docs.substance3d.com/sddoc/constant-nodes-142770194.html
"It's main goal is to function as a final output for the Text Node."

What I find myself needing are:
- String input values (as node in substance graph, and input value to node)
- Cast to string for integers and float
- Concatenating strings (+ operator)
- length of string

nice to have:
- multiplikation (concatenate same string x times, if x < 1: trim string)

setting a string variable with the sequence node also doesn't seem to work.

It would be great to have Open GL shadow rendering in viewport, same as substance painter/alchemist have. It gives us better representation of material than without it. It is cumbersome to switch between Open GL and Iray just to get better idea of shapes you are working on.

i would like to have the option for custom shortcuts for the Nodes in Designer it would be faster to work with. Most of the time you are using the same nodes over and over again. For example setting the B Key for the Blendnode and so on would speed up everything.

Add ability to set color(grayscale value) of selected pin(s) by picking it from the screen.

It would be helpful if split is included in tile generator and split can be influenced by greyscale input map

If you create a frame around a few nodes and give it a color, whatever node come out of that frame, the grayscale links will inherit that color. So if you make your frame red, the links are also red. This would really help possibly make the spaghetti a lot easier to read. This would be a huge boost to readability with the new magnet feature you added recently.
This applied to mainly Substance Designer.

Similar to other 3D packages like Maya and C4D, navigating the viewport with zoom can be done by holding Alt and right click dragging horizontally or vertically. Dragging up and right = zoom in. Down and left = zoom out. Designer only has up and down.

Adding horizontal zooming makes moving between software less jarring, especially for new Designer users.

Use AMD Pro Render instead of iray for pathtracing. Pro Render supports both Nvidia and AMD cards as well as great support for Mac using Metal2 backend.