Bonus stats on the secondary path
The goal that Riot wanted to reach with the runes reforged was to promote diversify but i don't think Riot was able reach it. Since we are still in pre season they still can change how the runes work.
One of my suggestion is to be able to chose the bonus stats between the primary and the secondary paths. If you chose the secondary stats the number would be lower than the number it normally be if it was the primary stats.
The problem of this suggestion might be that players won't chose the bonus stats from the secondary path because they would feel weaker, and it seem they would rather chose what are the best runes and stats for their champions.