I don't think a streamer rank is required, it's not like you have a special rank for VIPs and it will only make things look too much colourful imo, you'll see people who apply as streamers just to receive that rank, they will stream once or twice and that's all.
As for having a jacket with your IGN, that's not gonna happen. In order to have a jacket with the name "Falcon" on it, someone will have to design it and add the files to the server/adding it to the shop, it's not something that can be done automatically, they will have to manually write your name and design it. Now imagine doing the same with every other user in FGunZ, none gonna do that and it will only make the server's file heavier.
There are already more than enough rewards for being a streamer:
