Well since I for one love stats and keeping track of them, here are some ideas for new ones:
Weapon Stat Counters:
Critical Kills ( Players & Total): Keeps track of all critical damage kills.
Damage inflicted (Total, Structural & Players): Keeps track of total damage inflicted.
Reputation Based Kills: Tracks kills on people with a certain reputation threshold (maybe 10 or greater)
Cosmetics Stat Counters:
(The counters should be invisible while a player is wearing them, but once placed on a mannequin they become visible)"
Health Restored (Total): Keeps track of how many health points you’ve restored to yourself and players (med supplies skins please 
)
Minutes survived in a single life(Arena & Survival): Keeps track of how many minutes one has spent alive in a single life. The wearer has to be on a VAC and Battle-eye secure server for this to work.
Miles/Kilometers Traveled (Vehicle, Walking & Total)
Experience Earned
Reputation Earned
These are just some basic ones. If any are too vague I’ll edit them to be more descriptive.