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set_scale partially works, but seems to only scale the X dimension (while padding elements as if they were unscaled) for my container_h. These are vector images, if that matters.

I'll include my code, but as a warning it's very split up. I'll try and copy all the relevant snippets.
Both attempts (using a manual workaround and using set_scale) are included here. The only difference (aside from the two sections in the first block) is the last line of the first block, which calls uiContainerToElement instead of uiContainerImagesToElements when using set_scale.

        for (var i = 0; i < ds_list_size(_unit.actions); i++){
            var _action = ds_list_find_value(_unit.actions, i);
            var _sprite = _action.iconSprite;
            
            var _element = auto_image(_sprite);
            
            //SET_SCALE IMPLEMENTATION
            _element.set_scale(0.1);
             actionsSubContainer.add(_element);
            
            //MANUAL WORKAROUND IMPLEMENTATION
            /**           
            _element.set_visible(false);
            _element.staticScale = 0.1; //Easiest to toss a new field into the struct for reference later
            
            actionsSubContainer.add(_element);
            actionsSubContainer.add_space(-sprite_get_width(_sprite)*0.9);
            
            array_push(_actionImagesArray, _element);
            **/
        }
        
        actionsSubContainer.step(600*global.uiScale, (_yBase + 50) * global.uiScale);
        
        uiElements = array_concat(uiElements, uiContainerImagesToElements(actionsSubContainer, _actionImagesArray));

function uiContainerImagesToElements(_container, _images){
    
    var _array = [uiContainerToElement(_container)];
    
    for (var i = 0; i < array_length(_images); i++){
        var _subElement = createEmptyUIElement();
        var _imageElement = _images[i];
        
        _subElement.drawFunction = method({_imageElement}, function(_element){
            draw_sprite_ext(_imageElement.get_sprite(), 0, _imageElement.get_bbox_left(), _imageElement.get_bbox_right(), _imageElement.staticScale, _imageElement.staticScale, 0, c_white, 1);
        });
        array_push(_array, _subElement);
    }
    
    return _array;
}

function uiContainerToElement(_container){
    var _element = createEmptyUIElement();
    
    _element.drawFunction = method({_container}, function(_element){
        _container.draw();
    });
    
    return _element;
}

    if (true) {
        for (var i = 0; i < array_length(uiElements); i++){
            uiArray[i].drawFunction(uiElements[i]);
        }
    }