Is there a relation between Shigaraki's power and how many hands does it have in his body?
In Chapter 222, it was mentioned that these hands somehow help Tomura Shigaraki calm down aside from making him nauseous. If I recall correctly, this was the only function it had and serve no other purpose to Shigaraki or his power. 

Some of these hands are recovered from Tomura's family when he accidentally killed them. The other hands from two unnamed street punks.