[Maédhros]

The interesting thing in this is that, the direct consequences were:
That Feanor was banished from Tirion. He took as his place to live in exile Formenos which is north of Aman, and a more distant land than Tirion.
The attack of Morgoth in Formenos, probably would have been more difficult to acomplish if Finwe was still in Tirion.
Could this decision have afected the fate of Finwe?
No banishment of Feanor, no killing of Finwe. Hmmmmmmmm.