Spam (random invites)

As Matrix grows there are slowly the negative sides to show from that growth. Spam. I get random invites to rooms by different users.

Is it possible to make an third option when invited to a room (next to Accept, Denied): Denied and block user?

And add an option in blocked userlist: mark user as spam (if supported by Synapse and Admins) and give feedback to the originating server.