Here's the new standard for adding CHA to items:
- sold in shops or loads visable: 1 cha
- killing a mob, no matter what level or zone: 2 cha
The rest should be added to items depending on how difficult it is to obtain them and if there are other stats on the item too.
Example of a cha 3 item:
- killing a mob that is behind a hidden room
- receive as price in a small quest
Which leaves 4 and 5 cha for the more difficult or longer quests.
And yes this should probably be adjusted in the equipment guidelines too, at some time somewhere in the future.