Platform: PC
ISP: Frontier
Type of Internet Connection: DSL
Internet Connection Speed: 5Mb
Date & Time: June 10~12. forgot the time of day I dug while I had auto-regen set
Frequency: always
Character Name: Voidstorm
Race: Tarutaru
World: Ragnarok
Main Job: BLU
Support Job: BLM
Area and Coordinates: any zone where /dig is possible
Party or Solo: solo
NPC Name: /mount chocobo
Monster Name: none
Steps:
1. Raise a chocobo with auto-regen
2. register chocobo to the whistle (and mount npc if first time)
3. start /dig 'ing.

list of abilities and their effects:
auto-regen: none
Bore: adds an additional layer to dig from.
Burrow: adds an additional layer to dig from.
Canter: Increases mount duration. (no effect at First-Class endurance as 45min is cap duration)
Gallop: Increases mount speed. (no effect at First-Class strength as flee is max speed)
Treasure Finder: greatly increases dig accuracy.

Based on what auto-regen is and the fact there's a daily limit of 100 items dug up per day, it should increase the dig limit similar to how Blue Race Silks does, or greatly increase the frequency the chocobo does not eat the gysahl greens. I haven't found it doing either, so it's either a bug of was forgotten when changing how chocobo digging works. (or when I had auto-regen set, my luck was worse than terrible and it does do something, in which case please give a hint)