My suggestion is a feature that will let you create your own monster hunting quest.
Example: You want to hunt 100 Loli Ruri for the heck of it, but you don't want to count it out yourself.
Alt + U to open Quest Menu
Press Create Hunting Quest Tab
Monster: Loli Ruri
Count: 100
Time: 1:00:00
Submit
Now when ever you kill a Loli Ruri it will say #/100 Loli Ruri for the next hour
After an hour even if the quest is not finished it will disappear.
Max Creatable Quests: 5
Max Count: 9,999
Max Time: 168:00:00
You can Delete the Quest at any time by pressing on the Quest and pressing the Delete button at the bottom right of the information window.