I'm sorry, but I am also just as frustrated about it as you are. That is actually a limitation of the steam link itself. It requires xinput to be enabled and as far as I know also requires xinput-based controllers. 4 players is a limitation of xinput itself. I hate to tell you to hook your PC up to your TV to play more than 4 players but unfortunately that's the only way around it. Steam controllers also require xinput to work so you are locked into 4 of those max, steam link or not. However, you'd be able to use direct input controllers (e.g. PS4 controllers) in addition to the steam controllers if not on the steam link. Do you have any other games that support more than 4 players on the steam link? I'm willing to talk to the devs of those games if they know something I don't.
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