Allow users to choose how much rep to give, up to the max amount of a "full rep".
With the thanks button gone, the option to rep members a little bit for a good, but not great/awesome post doesnt exist. This is more problematic for the more active members with higher reps.
There are mods available that allow for this & many questions regarding custom modifications are answered in the discussion thread:
Let user choose how many reputation points to give (up to their limit). - vBulletin.org Forum