Me and my friend were thinking about this. You can consent to your friend or party member joining the range with you. This is mostly because of custom matches being limited fo the agents you already unlocked so either this or that

Riot should have an honor system at the end of the match similar to League where you can pick the teammate who communicated well and contributed to your win. Maybe add a skin you can get from these points or maybe throw in 1-2 extra RR in r...