The ultimate solution to fix Riven
Put her on mana. Make her passive 1 sec. Remove dash from her Q's. She just spins in place. Remove AoE from W. Just point stun one target only. Remove dash from her E. Scale shield to % of mana. Add a 2.5 sec cast time to her R activate. Add a 2.5 sec cast time to her wind slash. Add an indication like Sion's Q for her wind slash.
Hmmm... I don't think this will "fix" her. What else do we need for her guys?