I have an annoying problem regarding physical sensation of new or changed body parts.

Let's say I grow a tail in a lucid dream. I can see my tail and almost control it well enough for effective use. After over a year of development(a year because I have only been able to develop it within the dream ~6 times), I have nearly completed the physical sensation. But what if I wanted to generate a random combination of 6 or 8 limbs and such, when I don't have a clue of what it might feel like? Is there a way to receive sensation on the spot?