Way back in Forza 4 (my favorite and most played of the series) I really enjoyed doing the various hot-lap style time trials versus friends. I see that these trials have moved to the Rivals section in Forza 6. It seems there's a ton of variety there, and I'm really happy about that, but one thing seems missing. Is there any way to directly challenge a friend to beat your time, or get a feed when folks on your friends list are putting up times for you to try to beat? With so many races in there, the chances of me and my friends happening to do the same time trial are slim, unless we coordinate outside the game.

Am I missing something here, or did that functionality get dropped?