Slice the English cucumbers into 1/8-inch thick rounds. Sprinkle with salt and drain for 15 to 20 minutes.

In a large mixing bowl, combine the drained cucumber slices with diced crab and cubed avocado gently to maintain avocado's integrity.

In a separate bowl, whisk mayonnaise, optional cream cheese, soy sauce, and sesame seeds until smooth and luxurious.

Pour the dressing over the salad mixture and toss gently until fully coated.

Serve immediately, optionally garnishing with additional sesame seeds and chopped scallions or radishes.