Since the RR reduction is only for high elo, specially for the Radiant rank, you can think of this 5 stack queue almost as a different mode completly but inside the regular soloQ. I think they want to focus on people that want the full team...

I would like to have another option added to 50 and 100 bots: infinite bots and more stats like hs, body, legs % over time instead of time elapsed. I would also like an adjustable view cone where they spawn. That shouldn't be too hard to do...